Actually hold Z on any computer and it's still fine.
I don't like Joy2Key so I use Xpadder, you can do the same thing really.
Xpadder has a goddamn limit of 0.2s for turbo, which is a pain though.
Found a few ways around it, but it's 'whatever'.
If you're using Z as your button for AAS though, you can honestly just have XPadder hold it.