You can use carmods for both San Andreas and Vice City. But you can't use them in MTA. It should work if you don't change anything in the handling file as previously stated. Replace only the .txd and .dff files.
I dunno about the map editor but they will probably release a newer version of race when they are done with DM and have fixed most of the bugs that could occur on release of that one.
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huh?
Try to do this:
You get a crash at the address 652f30 when starting the game
This is caused by having the incorrect GXT file. To fix this, copy all the gxt files from the Grand Theft Auto Vice City\TEXT folder except the "american.gxt" into the Grand Theft Auto Vice City\MTA folder. You should also ensure you game language is set to english.
So, you want them to show some bugs in the video so less people wants to get it when It's done? They make videos so more people will be interested about the product, and if they show some bugs less people would want to get it when It's released. Atleats that's what i think would happend.