Around here (and at DCC ring games), the shot is usually scored as a point but it must go three rails first, not just two.
At any rate, I asked for clarification because I think the OP was asking about kicking a ball and making it bank off a cushion before going in a pocket, whereas we are now talking about just a multi-rail kick shot.
Right, both are optional house rules, but have to be agreed on up front. This is from 1p orgs bank pool rule page:
Some house rules permit rail-first shots, as long as they are called, and as long as a bank is designated following the rail-first contact.
Some house rules and some multi-player games permit rail-first shots directly into a pocket, as long as the cue ball strikes at least three cushions before the object ball is contacted.