This is allowed. What's not allowed is restraining someone through a window. If you break a window and jump in, that's within RP. Realism arguments about being cut up are silly, in video games and movies people jump through windows all the time. This is a game.
Does this expand to windows and entering a vehicle? For instance meth pro, rebels are shooting at you through the front door, you jump through the back window to escape or into an unlocked vehicle?