also vehicles.ide
That would be so cool.
Do you think making a topic about it on the SA:MP forums would have any effect? Maybe there would be some way for us to unite and lobby for it.
Given the way SA:MP already swaps textures (e.g. clean cars) and forces certain default files, it shouldn't be a difficult feature for them to implement at all. It would just be a case of making SA:MP download the handling.cfg/vehicles.ide before starting gtasa.exe. It could download it to the /SAMP/ folder and compare filesize every connect to save you having to re-download it every time you join the server.
Overhauling certain vehicles (e.g. Vincent, Sentinel, Nebula) to sports versions would be sweeeet.