just the fronts have sensors. Buy some new ones when you get the pads(from vx) they are brittle and almost impossible to remove with out breaking first time you do it, and from memory, dont attach the sensors until you are sure the pads are assembled with sensor wire routed correctly. Seem to remember haveing to do it over again with the correct routing or something like that.
Your handeling issues are to be expected with a 12 year old car, in the last 18 months a mate and i have done wishbones and bushes on my 03 omega,my old 99 omega, my father in laws y2k c70, my mates 02 e39 and his mates e39. Rubber bushes do not last for ever. Those who have had no issues imho probably have just not noticed the deterioration.
So anyway, suggest you ring Tony at Wim, 07948427383 and have a chat. Hes a good lad, knows his onions, and will take time to explane and probably recommend the nearest company near you if possible.
For info, basic procedure is, check for broken springs, worn steering idler, buggerd wishbone bushes(yours WILL need doing) and also rear donut bushes in the rear trailing arms.(triangular plate under rear doors) change any shocks that you think need doing, once all faults are rectified THEN take the car for a full geometry set up. Any subsequent change of parts can alter the set up. So, find the faults, rectify, then set up, preferably with new tires at the same company. Sounds like a lot but its worth doing, it will transform the car. :-)
Hth