Let's say you got a nice track, which has a potential shortcut, but the author was clever enough and blocked it with MT. Black screen for example. Sounds like a good solution, but what the main problem is, that you can open the map in editor (if you can get it(if you know how you can get ALL of them)) and just remove the MT and overwrite the track.
What does this bug do?
You can re-add the track on a server, and *POOF* you can drive the whole track without any MT! No blackscreen, no text, no helicopter view and no whatever the map author implemented.
How is this possible?
By removing any form of MT you actually don't change anything in the track itself for some reason, thus MX or Dedimania recognize the track (and replay) as being the same as before. Tested and checked this, replays can be posted on MX and Records can be drive online because the UID of the track remains unchanged.
How to solve this?
My guess would be that the MT should count as a block, so as soon as it's removed, the track changes and doesn't stay the same anymore and people can't post replays / drive records in an unfair way.
Hope anything can be done about this.

Best regards,
Vrba