(Is this thread too old? Should I list this wish again?)
I can not emphasize enough you how important this feature is. I certainly have appreciated all the improvements with each Archicad release, but I have waited for update after update for more control over roofs, only to find with each new release that this need has not been addressed
You can see here what the latest version of the less-expensive Vectorworks offers in this regard:
http://download2.nemetschek.net/www_mov ... /Roofs.htm
Please make the roof tool to work like you would actually build the roof with rafters or trusses - with the ability to change the rafter height at the eaves and to specify soffit and fascia details.