First of all, I think it would be a good idea to add a "disallow flying" option in the settings. This will ban jets and make it so buggies can't fly. That way we can have flightless buggies so you can race without worrying about cheaters flying. (I'm thinking GTR's desert right now)
Now, I think that Mars Explorer could really benefit from new game modes and certain maps designed for them. Maybe this would fit better on Syn3h forums, but it seems to me that Aubrey has abandoned that. Anyway, here are the 4 main ideas:
CTF:
-At least one flag on each team, maybe more
-Red and blue teams
-Team colored nametag
-Ram into flag to capture it, buggy turns quarry green, nametag might have special marking.
-Take flag to designated spawn (it will look like a forcefield) to gain a point for your team
-when other team shoots player with flag, flag is returned to its original location
-friendly fire option
-maybe cars colored by team color, maybe choice
-possibly more than 2 teams
-only on maps designed for this (we already have some ctf maps though)
-Maps designed for CTF will also be playable in normal mode (one of the spawns is designated as the default for normal mode)
TDM:
-Red and Blue teams
-Maybe more
-respawn after taking a few hits (probably takes more hits than in normal Mars play)
-points for destroying others
-friendly fire option
-only maps with 2 spawns
-possibly more than 2 teams
-Also can use CTF designed maps
-TDM maps can be used in normal mode (designated default spawn, like CTF)
KoTH:
-Maybe some team option, but mainly individual
-no flying vehicles (buggy flight disabled. Jets banned)
-Only on KoTH designated maps, with a designated game over area
-Of course KoTH maps also playable in normal mode
-We already have some KoTH designed maps
Race:
-Maybe some team option, but mainly individual
-Race maps have designated start, finish, checkpoints
-Certain vehicles may be banned for race mode on certain maps (example: no jets or flying buggies on GTR desert)
-Race maps can have multiple spawns for parellel racing (race on identical but separate tracks)
-We already have some maps designed for racing