Have any of you elongated the top strut tower mounting holes to be able to dial in more front camber?

I was talking to a track guy the other day and he said that many of the 996/Boxster owners have done this and managed to get up to 1-1.5% of negative camber. My car currently has barely .5 and its' maxed to the inside of the holes.

Let me know you thoughts as I'm considering taking the drill to my car this weekend.

Bart