I am sorry, but I do not get your idea. The major problem is that Garmin Mobile PC/XT will NOT render custom (user-defined) maps properly no matter how I produce these maps (via EasyTrace, MapWel or other software). I was hoping that some softeare will produce custom (with user-defined styles of POLYGON areas) maps that will render correctly in Garmin Mobile PC, but it seems that there is no such available..
EastTrace 7.99 (I believe that you mentioned this particular version) is far less advanced than WiseImage 12 (available at lavteam.net). Anyone using EastTrace 7.99 should definitely switch to WiseImage 12 to get better results with less caffeine.
Regards.