Bit of a late answer, sorry about that chief.
I decided not to use RichMemo for my project, using instead KControls. This was a decision made mainly when I found a rather intimidating list of problems on the Mac. It seemed inconsistent with what I read on the main RichMemo page. Listed in the discussion section of the workaround page.
I also found it difficult to see if any further development was taking place with RichMemo, from memory, a new 'release' seemed to happen weekly but no changes seemed to be happening.
A pity really, its a much lighter weight package than KControls.
Davo