Thanks everyone. Lot's of good info.
My players stack Haste with Adrenal Speed and I'm ok with that. Goose/Gander.
It's interesting to point out that they don't use it often. This isn't a standard combat tactic.
(When the Monk was just starting out, he failed a RR (after neg down a SCSM) and became addicted to Haste. If you could double productivity with no loss of quality, why wouldn't you do it all the time? What elso does a Monk need PP for?
He kicked the habit (...) and just used Speed, non-habit forming, for 2 lvls.)
It
is awesome for crossbows, or 2 rnds spell prep AND casting in 1 rnd, or concentrating on one spell while shooting a bow and then casting another..
I do like the 300%Act max and 3 actions/rnd rules. Then you can use any remaining %Act for movement at the end.
Although I could understand arguments that 100%Act allows 3 roll-able actions, so 300%Act (+)
could yield additional roll-able actions. "Combat is a series of actions that is resolved with a single roll." You aren't really attacking more, for example, just increasing the chance that it's going to be more effective.
For now, I'll stick with 3 actions totaling 300%Act when stacking Adrenal Speed and Haste.