I can't sit in a chair in full armor but I can sit on an arm or corner of a table, some modify their armor so they can fully sit but I have soft costumes if I want to sit around all day
You need to ask for 501st access here on FISD first http://www.whitearmor.net/forum/topic/16-501st-trooper-status-requests-include-link-to-your-501st-profile-in-your-request/
Was going to look into this soon as I'm in the middle of a clone build and I have that blaster sitting to one side, thanks for the work, saves me sitting there working it out scratching my head