I think the possesiveness will get worse...I moved out early and now I get along great with my mothers, sometimes it is the only way
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Since your DH needs to work at a computer you can't move out to the car....
Sounds like your parents are not real winners...... (either set)
Seperate bedrooms..meaning truly seperate? cause if so then you really are being forced into marriage if you go get it legal..but if you aren't really seperate, just the illusion of it..then you already are married in all but legality, go for it. (and put it too him that way, might make it easier on him.)
Please do NOT take that as a comment on your decision to sleep together or not, I do not mean it that way..I just figure that a marriage liscense and such is merely a legal formality, what you pledge to do for and with each other is your own. and what truly counts.
BTW while rob might find it win win, obviously you and your MIL are not......