If I got it right, low sequence and high sequence characters will have advantage over regular chars - low sequence char will spend less than half of his APs every time and high sequence char will try to keep his APs lower than half all the time. Doesnt seem too logical, but it can make things interesting.
If you find interesting to spend only 1/2 of your AP all the time (if you're low sequenced), then yes, but I think a guy with the same ammount of AP, but high sequence, or even middle sequence will have 100% of thier AP and can use it properly, while low sequenced will have only 50% of thier AP, if they want to regen it with the same speed as high sequence.
But again, you need to spend APs on running, so low sequence will be always worse than average, and average worse than high. Of couse it also requires balancing, it can be even made from average (20%/20%/20%/etc) to high only, so with lowest possible sequence you'll have the same AP regeneration all the time, while than more sequence you'll have than faster you'll regen 1st half of APs and slower 2nd half, if current suggestion will be really so easy to exploit. But again, APs aren't regenerating when you doing an action, it means you'll need to wait everytime to keep your APs in 2nd half for slow sequenced characters, while high sequenced can spend all thier APs so work in 100%/50% = 2 times better at the begining.
If it was up to me, I'd use sequence to determine starting AP. So with low sequence one would only regen 2-3 AP when out of combat, when combat starts the AP regen to full at normal rate.
As someone said about that: you'll see guys punching each other to keep themselves in combat and have full APs.
