Yeah, that was one thing that bugged me a little about TDU, mainly boost gauges not working, among other gauges, but the one thing they did do well is use a working GPS/Map on the screen in some cars that have screens in them, that's the one thing that annoyed me a bit about MC:LA.
Real world places would be good, the Ben Sherman signs and others in TDU did make it feel more like a real world, but I think the main thing TDU2 needs is in-depth performance tuning. E.g. Instead of Stage 1 and Stage 2, etc. have different Air Filters, different Cylinder Blocks, Exhaust Systems, Connecting Rods, Crankshafts etc. and maybe in the description of each item say whether it's equivalent to Stage 1 and Stage 2 etc. just to keep the average person who doesn't know much about the parts up to speed, because I know more power can be extracted from an RB26DETT than 400 :p.
EDIT: Also, I read about Blu-Ray and watched a few keynotes on it back before the PS3 and Blu-Ray was commercially announced (probably about 2005, 2006) and originally they were promoting their Dual-Layer 500GB discs (250GB on each side) so I'm not sure if they decided not to produce any more because of costs or anything, but yeah, it is possible, and there's a new thing I recently read about that Toshiba or Siemens or someone (not sure who, it's a popular company though) is making and it boasts 1TB Quad Layers (250GB on each layer) so yeah, we'll see what happens. And yes, there has been a lot of talk of 8 and 16 layer discs, my bet is on 8 layer discs coming out before 2010, but we'll see.