Hi,
I could be wrong, but as far as I can tell, the Tiny implementation for Revo is still being worked on, and there seem to be precious few items you can set from the Manager.
I also know that using entities is an ongoing problem for non-English languages (so what else is new?) - people have code fixes for that scattered around, but nothing solid, mostly boiling down to item-by-item translation - not much fun. Tiny is used by "everyone", so every implementation is different. I’m guessing that you’ll have to dig way into Tiny’s own code and in particular, it’s initialization parts. I’ve done some spelunking in its config in the past, and didn’t enjoy it especially much, but it’s certainly possible, especially if you’re an excellent programmer (that wouldn’t be me).
So unless someone has a brighter idea, you might need to find the plugin code and dig into it yourself.
Judging by this page, it does seems as though entities can be played with quite extensively:
http://wiki.moxiecode.com/index.php/TinyMCE:Configuration/entities