Not all resolutions changes are good for all...
Some computers will be crash and GTA VC itself will not start working...
The one stable for all computers resolution is 800x600...
Your suggestion can lead to the non-stop complaines "I have a black screen when my game starts"...
I checked it already... The first times it is normal, then it crashes... I had to install Gandalf's user files to bring back the normal 800x600 resolution, because I could not even change it in game options, and the one way to solve it was - reinstall GTA or get user files from friend... And after it I already had no any problem...
When u are kicked - you can easy check the WHOLE logs in your mta chat file or in MTA window...
This is how I check the history of some problems on server...