Anyone else notice that they mentioned 'Opportunity Actions' before the well-marked 'Opportunity Attack'? Implying that you may be able to do something else other than attack? Could be interesting.
As for the 15 min. workday issue, I think the proliferation of at-will and per-encounter spells makes the loss of one per-day ability relatively minor. Unless your player's names are all Cheesy McBeardstein Von Metagamer, it shouldn't be a problem, and if it is you've got a problem that no rules can fix.
As for the 15 min. workday issue, I think the proliferation of at-will and per-encounter spells makes the loss of one per-day ability relatively minor. Unless your player's names are all Cheesy McBeardstein Von Metagamer, it shouldn't be a problem, and if it is you've got a problem that no rules can fix.