Trying to figure this out. The default of back, forward, X is too difficult to consistently pull off in the middle of a chain and also follow up with another skill input and tends to end up making you do the forward/charge version of it even when you don't want to. I've heard the suggestion of "space", and that works fairly well... so long as you don't actually have to move or readjust yourself at all before using it. If you do, it's too easy to trigger a buff and mess up your chain, unless you remap all of those to something else. (And if so, what?) Mapping it to Z makes it harder to use the launcher with it (since you have to map it to something else) and that's such a useful go-to chain extender that I hate to do that. I'm honestly a little stumped. EDIT: Just Down+Z came to me, but I'm sure I'm missing an obvious reason that's a terrible choice.