Why is it that casting deadly magic is seen as either an exploit, a break in the system, a power creep, ect...
when infact any equal build other mundane character is as effective as the mage or even more effective.
It isn't even so that the mage is a all character replace guy, and trumps all party members in their chosen task.
The mage buys from start max 12 spells for 36 bp. + 15 bp for the mage quality
What can mundanes buy for this 36 bp + 15 bp or 180.000

.+75.000 Alot.
On top of this, don't forget to have the players
always roll for drain, not buy the hits. This will leave them at the end of the day with some hefty damage. Especially when using multiple opposition. Or treaten to shoot their party members.
Always attack from more than one side. If the mage can't see you with his normal eyes he can't target you. Mayby if he gets a cybereye in the back of his head, which eats up essence, thereby lowering the power of your mage.
Does it matter how the NPC got whacked, is there a difference between using magic, a bullet, a granade or something else? Does it make them more or less dead?
For control thoughts and having them kill them selfs. Boohoo, A sam kills the opposition on any given day faster and more reliable.
For getting past those nasty keypad locks on doors, without resorting to explosives go right ahead.
As interrogation technique, effective it's cleaner. But a bullet to the feet and the knees and the .. (you get the picture) is also quite effective.
As for the mass control, if any resist, have them do a called shot through the eye/head (extra damage) and see if the mage is still able to command the masses.