You're right but I didn't say "gimmick", I was just talking about the OP's train of thought regarding the sentence "What I was thinking was what if Regen became a new kind of defensive set". I think Bio takes this premise already.
And I'm not against adding some +absorb to the set, I just don't think that should be its gig (putting it in Integration would be a good spot since that power is very meh...but 40% shield that regens at 5% per second is a bit much tho....that's over 100pts of absorb per sec ontop of your regen) Another thing I like about Regen are its clicks and quite a few folks want to alter (or realter, as the case may be) to make the set more passive. The hills and valley feel of the set is also why I enjoy it.
The set the OP outlines, while nifty sounding, is very different from the current Regen.
That all being said, I'm only stating what *I* want for the regen set. I've come out before saying that my personal perspective of the set is that it isn't "Comic Book Wolverine Regeneration"...that's Willpower. Regen as a CoH concept is more like "Cartoon-logic Nullification" where you can get *SPLAT*ed, show the damage, shake it off and instantly be back to normal. I built all my Regen concepts around that and it works for them. Just my opinion, though.