Hello,
I stumbled about this topic when I was implementing my subtitle widget with outlined fonts:
http://www.gamedev.net/topic/657594-font-with-outline-not-rendered-correctly/
I also made a workaround that fixes the problem in an interesting way.
This is the original render error (see yellow subtitle):
https://docs.google.com/file/d/0ByWKJMpxOBKFMkl4blNVcVgtZlk/edit?pli=1
This is rendered with my workaround (see yellow subtitle):
https://docs.google.com/file/d/0ByWKJMpxOBKFS2lEeDdOYndDWXM/edit?pli=1
Is the original author of the bitmap-font integration still active?
In the same forum, AngelCode creator Andreas Jonsson wrote, that AngelCode is now open source (since 04/2014). 
Have fun,