There's recently been a discussion on this here; apparently if you switch your codepage to Japanese you are able to use the far superior Windows IME with JWPce. But as you are from Belgium, that may be problematic as it will break many non-English programs, as well as French/German/etc filenames...
You can get some inline dictionary functionality (and a little extra) by using smth like Google documents paired with Rikaichan.
You can get some inline dictionary functionality (and a little extra) by using smth like Google documents paired with Rikaichan.