1. I don't know what you mean.

2. You can just use items, can't you? Just make the item(or armor if you use a cloak or sumting) and do a common event like this:

<>CB:cloak equipped
<>CB:key A pushed
<>change hero transparency: transparent(or you could make an edit of your hero sprite to make it black-'n-white so you can know where you're goin'. In this case, use "Change Hero Graphics")
(Make another Conditional branch here.)
<>CB:cloak equipped
<>CB:key B pushed
<>Change hero transparency: Opaque(or use "Change Hero Graphics" if you made a black-'n-white sprite.)

Goro goro!