The key assignments kind of weird me out.
While placing an object, I keep wanting to use WASD to pan the screen around. Mouse scroll is not consistent and causes trouble when trying to get just the right spot. IMHO Other games I have played use RMB to rotate the item, leaving WASD for scroll…
After placing something (or moving something), you can hit RMB to stop placing things… but if you hit RMB twice, you will delete the item you just placed… this has caused me to delete way too many things. I also sometimes try to RMB/drag to scroll with bad results. IMHO, either make us use the dedicated delete button or at least have a confirmation on delete.