Ok I know you can change the properties of a doodad to allow it to be placed in a illegal position, my question is how do you do that with placing all doodads so you dont have to go into the properties each time. Would speed things up alot!!

Press shift when placing doodads.

Same works for units! Actually everything else if there is something else^^

Read this completely: http://www.staredit.net/topic/11588/
I'm sure you'll learn A LOT of things.
For example, the fact that pressing Shift helps you placing doodads (and units) anywhere is written down at the very first line. XD

yeah i stumbled upon that list 4 days ago.