Sim City? is there an undo command?

No there isnt... you can hit ESC key during an action to cancel however. Once it's done thought it is done ☹️

I wish. Plopping something down and having to move it for efficiency later is frustrating and costs a butt-load of simileons, if you're not doing so well.

Often times I miss-click a road..

I wish you could at least get half the cash back or a move option for ploppable buildings.

I just demolished city hall trying to make a road next to it flat =-(