Feature Request: Support Type Volumes

[AbeFM 35]

I was trying to solve a nasty print (the sort where a single support added in would fix it, but we use the tools we've been given).

 

I would like to be able to have the "Don't Support" option let us pick either supports or tree supports. The trees are almost perfect, but sometimes need a little help. 

 

I'd like to draw a block for all the "tree only" areas, and use standard supports elsewhere (for the places Tree won't work right (because it doesn't have a "roof" as discussed before).