Danger Wrap is only optional IMO as is Crash Bomber, like I've said before with pretty much all the customs, I don't feel like it overshadows Crash Bomber at all, and while it is true that shields recover pretty fast, they decay a lot faster in this game as well. You can get away with poking very often thanks to the crash bomber and air shooter especially if you plan to actually do damage. Danger Wrap however if you can get it right and choose the right counter pick stage, like D. Plaza, it really shines on such stages. Other than that, you'll find it more situational use in neutral stages... Unless you really know how to get it to hit people every single time.
I don't find the problem with Mega Man to be killing though when we consider his tech/glitchniques as well. His problem feels like on the ground, he's got more issues with certain projectiles than anything else. (That includes rush downs.) Unless power shielding is your strong point, that I feel is problematic especially when facing more well establish defensive characters than Mega Man... Which is why I've considered the Skull Barrier especially if you go with it with crash bomber.