I know the problems with space dude dont you worry, i have the smallest room in the house which is my bedroom and also where my comp is, what i do to stop the chair moving is simple and very effective, i just lay a couple of Towels down and put the chair on top the wheels sink into the towels and it doesnt move any more

as for adjusting heights/angle of the pedals i simply push them to the wall underneath at the rear of my desk, once against the wall, i will place a folded T-Shirt, yep folded! and place it under the part of the pedals against the wall elevating them making the angle more comfortable! i will add a t-shirt if its not enough or if its to much unfold it a bit

i play with chair height too, and with that the angle my pc screen is titled so yeah i much prefer a chair without wheels to race with but none of them are comfortable enough the ones i have

Hope that gives you some ideas of ways to mess with things, obviously dont use your favourite shirt to prop up pedals :P
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First ever win: STCC, Donnington Park, Race 2, 19th March 2012
First Ever Podium: 2nd, Silverstone SCES 2011
Wins: 1
Podiums: 6 (2 SCES, 4 STCC)
Pole Positions: 1 (Race 1, Thruxton, STCC, 8th April 2012)
Fastest Laps: 0
Team: Ozjet Racing
Number(s): 26 (SCES) 27 (STCC)
Also Core-Racing driver. V8 Supercars in Jim Bean Racing Ford and F1 Series for Ferrari