QUOTE (Falconer @ Dec 15 2009, 02:31 AM)

Yeah Thanee, I've suggested that in the past as well for people trying to limit overcasting. However, generally that was before the optional rule on direct combat spell drain increase. If you're using that, it's a bad rule and just completely screws the mage. Also generally, I'd only limit it to combat spells, as it causes a lot of unintended consequences elsewhere.
Of course, this house rule comes from the earlier days of SR4 (the second one even dates back to SR2, originally). The optional rule for direct combat spells wasn't around by then, and it's also not used (because it doesn't work in a consistent fashion).
As for the noncombat spell issues... I havn't encountered any of those, yet. And we used this house rule pretty much all the time we played SR4.
I also cannot see any real issues with background count. It's supposed to be rare and it's supposed to limit mages. If it doesn't do anything, effectively, but impose a mostly neglectible dp penalty, what's the point? It could be considered, though, in combination with this house rule, to drop the extra Force increase for Drain. Since lowering the Magic Rating effectively includes that already. That part is therefore unnecessary. I will definitely consider this.
You are right, of course, that combat spells (and summoning) are the main issue here. But I do like the more general nature of the rule.
About spirit summoning, I'm still not entirely sure about how to handle this, but I'm leaning towards generally not allowing the summoning of spirits above your Magic Attribute.
QUOTE
However, there's a far easier way to state it than what you say. Just add 1/2 point drain for every point over the magic rating.
And it gets even easier (which is how I actually state it usually, but refrained from doing so here, because it is a little counter-intuitive).
DV = F - M/2 (round up) [this replaces the F/2 part when overcasting].
BTW, what's unclear about the Increase Attribute spell? Of course, as written, the Force must equal the attributes current (un-/augmented) value.
The final value (after the spell) doesn't even exist at the point of casting, so how could you even compare the Force to that?
Also, the fact, that the part about the Force having to equal or exceed the (augmented) attribute's value comes before the part that the hits increase the attribute in the spell description, is rather telling.
If it should work like you think it does, it would have to say something like "The increased attribute cannot exceed the Force of the spell."
Whether that is abusable or not is another issue entirely.
Just don't abuse anything, that is abusable. That's a really easy way of handling such things.

Bye
Thanee