However, I have discovered, that compiled programs (including the compiler!) do work. So... I have a vague idea about writing a replacement editor for STOS, which could save STOS .BAS files, and then call the Compiler. This would make it possible to create STOS programs under MultiTOS.
This one may never appear, but I may hack enough of the STOS file-format to be able to create an ASCII -> .BAS converter, which could be called from another shell, allowing developement to be done...