grammar - As if + would is correct as in idiomatic use?

Technically, there may be grounds for objection, though I doubt most native speakers would notice even in writing unless their attention were drawn to it.

"As if" is an abridged clause of comparison, so "as if you would be able to drive it" is the elliptical equivalent of "[you want to drive it] as [you would drive it] if you would be able to drive it." You see how wrong the double conditional looks in that full version.