I've tested KeyMinder in 1.7 and it works beautifully, I haven't had a chance to test AceLeash yet ... no pets.
Anyway, drop by the AddOns thread and leave a bug report. If you wnat a more immediate response though, leave it at my Wiki. I'm more likely to get to it that way. Just put it at the bottom of the bugs and work list. You can find my Wiki information in the 'How to pester Rowne' thread.
Yup, MapScroll can do that with its Hider module and Visor can do it too, you just have to reparent properly.
*Rowne is all-encompassing!
Seriously, if there's ever a feature I haven't thought of, let me know of it and I'll drop it into a module. The one reason my AddOns are popular (I believe) is because lately I've been going modularity nuts and I think everyone can agree that this is A Good Thing. The reason for that is that if someone wants a feature for MapScroll, I can just drop it in a new module; the person who asked for the feature gets what they want and the people who enjoyed the purity of the original AddOn only use the modules they want or none at all.
I just need a way to split up the ChatCmd table before I achieve true modularity. Note to self: Talk with Turan about this.
From the ones I've actually tried (I haven't tried all of the ones you've listed there);
Flexbar can cause insane resource issues, it's a real resource b*tch. The players who use it tend to think the resource usage is a fair tradeoff though, I never did however so I don't use it.
Gatherer can create -huge- SavedVariables.
LootLink can create absurdly large SavedVariables, there are other, better alternatives out there.
MobHealth (dunno about 2) created the largest SavedVariables I'd ever had (well, next to that trainerskills remembering AddOn anyway), I honestly don't recommend its usage at all.
I've been impartial here, I haven't recommended based on personal preference but purely based on what you asked, which were the nastiest that I'd found? That's all the information I've given you. I won't suggest replacements because I don't want to seem like I'm being pro-Ace over anything else (it wouldn't be fair, even if I think Ace is better than everything else).