Use TM Unlimiter (the tool that removes block placement restrictions) and see what you can come up with.

http://tm.mania-exchange.com/threads/view/851/tm2-unlimiter-is-out

This tool makes a massive difference and enables a lot more transitions and things like platform tracks built into canyon walls and banked-platform-to-banked-road transitions. Basically a lot of what people have been asking for and didn't get from Nadeo. There are so many new creative ways to build tracks with this.

It's a cool thing, although I remember some problems with tm-unlimiter in TMU.
I think a lot of maps that were built with the unlimiter didn't work online and caused player bans and crashes.
Did you test your tracks online?

That's only if players carelessly mix multiple CPs together or mix CPs into start/finishes.

It must be used responsibly, but if it is... it can yield some amazing results.

A little update. I just drove a track with 2 CPs mixed online and it didn't ban me. My times weren't submitted to dedimania because of "Wrong checkpoint times", but the dedicated server didn't ban me from the server like it would have in TMUF.