Re: Dr. Terror's not so terrifying PRE
I've never observed a high PC presence to be an issue. There are typically multiple negative modifiers to the number of dice, and it only hoses someone for a phase as far as I know (after which, there's a recovery). The only time I ever got irritated with a high PRE was as a player, where the GM had a villain throw her 90 point Magic pool into +90 Presence, then houseruled that the Presence Attack table continued on, with every 10 over being another phase of frozen in terror without actions. Nobody got an action until something like Segment 8 of the second turn ... oh, and did I mention that this villainess was teamed with Dark Seraph and his 18d6 Explosions? Yeah, that kinda sucked.
Anyway, I personally would just put a cap on it (of course, I cap every attack power). I'd also mention that putting 50 points into Presence is sixty active (base 10 + 50), just as a side note.