Collapsing is now supported in release 1.0:
Source Code Folding Shortcuts
There are new folding actions to collapse source code regions based on their folding level.
There are actions to fold level 1 (Ctrl+K Ctrl+1) to level 5 (Ctrl+K Ctrl+5). To unfold, use Unfold All (Ctrl+Shift+Alt+]).
The level folding actions do not apply to region containing the current cursor.
I had a problem finding the ] button on my keyboard (Norwegian layout), and in my case it was the Å button. (Or two buttons left and one down starting from the backspace button.)
