The most suggested feature is here: select multiple unit with a selection box and copy-paste them anywhere with a Ctrl+C!
You can also undo and redo your previous action with (Shift+)Ctrl+Z.
Also, you now have ice on mountains tops and on forest grounds near poles.
Remark: For the selection, there might be some position offset when you copy or paste over pentagon/heptagons, but those are highlighted so you'll see if this is the case.
Plan B - v0.9.3 build 1014 
Major improvements:- Multiple selection, copy (Ctrl+C), cut (Ctrl+X), paste (Ctrl+V).
 Use selection box, double click, and modifier shift/ctrl to add/remove from selection. 
Use E/R to mirror or rotate selection. 
Export or import selection to windows clipboard (Shift+C, Shift+V)
- Undo (Ctrl+Z) or redo (Shift+Ctrl+Z)
 
Improvements:- Drag system improved (ghost item while dragged). Need some time to trigger, to differenciate from selection box
 - Display ice on mountains and under forests in poles, and in high mountains in lower latitudes
 - Add mouse wheel sensitivity option
 - Dynamite mountain models more discreet
 - add info page for selection, copy-paste, ctrl-build, undo
 
Bugs fix:- Fixed bug with space that toggle menu
 - Fixed ship path over spacelift cable
 - Fixed ship path flashing in green/yellow
 - Fixed water flow line going crazy after a terrain level tool
 - Fixed bug with info panel
 
Minor:- Update loc from/to Crowdin