Hi,
In regards to the entry on the Homepage
"Difficulty Level: Medium: Math expression control: Control to evaluate an expression based on value of other fields and display result. Example: Show effective priority which is function of Priority & Severity. "
Maybe you could get in contact with konamiman who already did that for TFS2010 and integrate that into the Project?
Konamiman's ExpressionControl for TFS 2010
BR KarmaEDV
**P.S. Please correct the title to "Your suggested Math expression Controller ..."