If I remember correctly there was a memory upgrade for the STFM which took it to 8 - 12Mb or something, I do not know if this memory was registered as TT RAM but there was a program that came with it to enable programs to use it (I think it simply went through the code and changed bits around).
I have never seen the program nor the upgrade but maybe thid program (or something like it) could help fource programs to run in TT RAM and not ST RAM.