list of concerns here
1) It'd be something worth trying maybe, but it is just one sound effect...
2) Maybe you didn't notice, but being able to use charge kick in the air is how you reach some of the goodies in Charge Man stage.
3) Never really cared about obituaries, so why not?
4) Again, in the few stages it turns up in, its purpose is to get utilities (best example being Heat Man stage). And, as Ivory said, Skull Barrier is already over powered. Controlling its usage would make it worse.
5) Again, not really concerned..
6) You apparently are a very lucky individual. I have only seen one of these dropped by the walking purse. Although, I'm pretty sure that each item has the same amount of chances of being dealt (At least from what I remember, may have to look at that again)
7) Not a good idea. Wild Coil can be a pretty awkward at times, but by making them bounce higher...ugh...This is why I stick to melee weapons.