I have 3 entrances to my room and will be installing a 2 gang box at each door. Each 2 gang box will have a 4 way switch operating the main room lights plus an additional light switch for other purposes (exterior, stair, garage, I'll call these the B switches). Do I need to bring 2 separate power feeds to each box? Or is it possible to wire my 4 ways so they are always hot and I can pull power from each 4 way to feed each respective B switch. Any recommendations would be appreciated. Thank you in advance.