I do have a single speed bmx freewheel somewhere.. which I picked up to turn this bike into a single speed but never bothered with it, mainly cause I broke the shimano 400 derailleur I had on there initially.. now I have a suntour VX which sucks so I dont care if it gets ruined. I kinda like having gears still though.

The front derailleur cable usually freezes up on me so I pretty much keep it in the large ring always which I typically do anyways. The rear one never seems to freeze on me though. I rode a similar set up last year and never had problems with the cables freezing on me, so I dont know how I do it, it just works!