mscim appeared in devel-extras this evening.
i installed it and its deps (mscim mscim-modules-table mscim-tables-ja) and it works great!

there is a configuration app in the n900 settings.
ctrl+space changes input methods.

mind that this disables the SYM key and virtual keyboard functionalities, just like on the 810 =\
anyone know how to easily get to the extra symbols (specifically the pipe |)?