Not for me. Frankly, the movie sucked compared to most of the books.

I think it was done for effect. When a drug lord sees someone setting off mine after mine without receiving so much as a scratch he is more likely to give up information.

True, but most solutions would result in nerfing Sinanju, to varying extents. generally speaking, anyone with training in Sinanju should be several times more powerful than someone with equal training in any other martial art. That fact alone is potentially game breaking.
Sinanju can provide some interesting situations and interesting NPCs. Its quite possible that the greatest house of assassins is still employed by the Emperor of the UCAS and could cross paths with PC runners. But, I wouldn't let a PC actually have Sinanju training.
There is only ever one Reigning Master and one apprentice, so rarity is an issue. Then, there is the scale to be concerned with. Sinanju is paid several tons of gold bullion annually for their services. They deal with gods and heads-of-state on a regular basis. If your runners regulary opperate on these levels, then a Sinanju character may be good for the campaign. If not, the Sinanju character would take over the campaign.

Also wrong.

There is still a normal attack roll (without permission to use combat pool for the non-obvious version) involved, regardless of the described situation of kissing the person on the cheek => If you roll successes against raised TN with the called shot modifier then no armor will apply, otherwise it will ...

Initially worn, since the damage test is resolved instantly after the attack. The damage simply doesn't surface before the sustaining time has ended

In general: Yes ...

Yes ...

Only if you allow called shots to bypass armor in the first place

But, used as a gimmick like that makes Sinanju lose most of its flavor.

You might want to take a look at page 85 and 86 of Cannon Companion under "Called Shot", last sentence: Only armor worn in the targeted location protects against this attack

That rule supercedes the core rule once you use advanced melee rules (And generally that's one of the main arguments players use when demanding armor nagation in ranged combat) ...

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Opposed to the house ruling that can be found in the FAQ on www.srrpg.com concerning ranged combat this one is most definitely not a house rule ...

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They can ...

Pretty much because the rules do say so. Yo have asked for cannon references. I gave 'em.
The damage resistance is resolved at the time of striking no sooner no later ...

it's magic ...

Hyz, show me a person who, after years of training, can run on open water without benefit of additional support.

Sinanju or Shinanju is already highly, highly fictionalized and remember, this is a game where unarmed attacks cannot kill you. They only do stun damage unless modified by bone lacing or a weapon of some sort.

A baseball bat does not deal out stun damage - but according to the rule set, it does.

In SR, you're either magical or you're not - and learning Ninjitsu or Shaolin Kung-Fu or any other mythical martial art will not grant you abilities beyond the physics already established.

So no, I don't think using Sinanju as window-dressing interferes with the flavor as the concept clashes with the SR mythology.

-Siege

No ...
It's not that easy: M Stun with 12 net successes (that usually requires yet another adept vs. a mundane "weakling") will stage as follows:

M Stun => S Stun => D Stun and 8 net successes left ...
Now the question is: Do you play with deadlier overdamage or not?

If not those extra 8 net successes may be used to increase the power of the attack by 1 per 2 successes => The victim will do a damage resistance test against [Str attcker] +4 D Stun ...

In this situation you'll never cause physical damage in one blow against a previously unharmed opponent.

If you play with deadlier overdamage the 8 net successes can be used for two different things: Either you increase the power of the attack as in the previous example and / or you use 2 net successes to inflict 1 box of extra damage.
In order to be able to inflict those extra boxes, the power of the attack must be >= 1.5*Bod[victim] (or >= bod[victim] if you choose the really nasty game play).
Provided that the attacker's strenght meets that requirement, the victim will then have to resist [STR attacker] D Stun plus 4 boxes of extra damage (The question of how those extra boxes are resisted can be quite controversial).
The net successes could be assigned to either effect so, it could be necessary to put some successes into power before the deadlier overdamage can be applied (e.g. 2 into power and then 2 boxes extra damage).
In order to to kill someone (who is uninjured) in a single blow with that, You'd need 24 net successes and a strenght that fullfills the deadlier overdamage requirements and the victim must not score any successes on his resitance test ...

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There is however another option apart from the already mentioned cyberware:
Martial Arts with the Vicious Blow maneuver inflict physical damage at IIRC increased TN (+1) and stage damage with per 4 net succusses instead of the normal 2 ... 8 net successes will do the trick there (provided that the victim doesn't score on its resistance test) ...