Unicode support has already been suggested and shall be implemented in a future version. Feel free to submit a patch which implements Unicode support in MTA. Issue #3919
You seem to be using MTA: Race, possibly with an Operating System which is more recent than Windows XP. MTA: Race is unsupported, the current and supported release is MTA: SA 1.0.3 which also includes a map editor which is more advanced than MTA: Race's map editor. It also includes race and supports Operating Systems higher than Windows XP.
Issue #28 Page 40.
***EDIT***
Ok guys there currently are many problems going on with the editor, the MTA articles are being ruined. I am currently trying to find another way to publish MTA articles as this problem has been going on for far too long. Any suggestions?
If you would like to view the ORIGINAL article click HERE (Page 1-2).
Well in my opinion there should be an option for what type of server to search for, it's it's race only, or if it has mods enabled etc. Or you could always start your own server which has mods disabled.
Slothman is right. You can have as many players in the server as you want to edit your maps. As long as you don't try to edit the same object at the same time as it disallows you.