Thanks for your report, and sorry about your comment on ManiaDrive website, it was flagged as spam
a) map thumbnails -> good idea, but must done on server side (and it will require some work) to make the whole thing automatic.
b) more maps! -> Yeah ... we know it
c) more cars (hate Clio ;P) -> Blasphemy ! This is the only "real" car in the world ! More seriously, we've planned a huge enhancement for ManiaDrive, with a new world (new blocks) and a new car (and perhaps more) with a new physics. But it's a huge task ...
d) more cameras (better) -> Well ... Can you say more ?
e) where is map editor? i cant find it... -> This is "mania2".
f) Internet (not only LAN) multiplayer Wink -> Planned, require a lot of tests on the Raydium network stack. You may test how it works for you with the current version
I've updated the Roadmap according to some points of your message.
edit:
ManiaDrive 1.2 is the last release with a "flat" file tree, since Raydium now supports a "media path" feature.
... and about the source code in one file, we've already talked about this many times : it's like this for now, it may change one day. For us, ManiaDrive is still a small application for Raydium (= 1 file).