Is there a tape measure function? That would be super helpful also pushing and pulling a surface to match height / length of another surface would make a big difference and lastly having automatic division points in lines or the ability to divide Lines would be great.
Another is when drawing a line to be able to hover over an endpoint of another line and automatically match the length of the hovered line.
Oh yeah, and the ability to lay guide lines and erase them would be super super helpful, snap-to guides are pretty standard in most programs.
If any of these features are available please leave a reply and let me know how to access them.