The topic says it already. Being able to use the left and right arrow keys in the lister, which don't do anything at the moment, would be a nice enhancement for keyboard oriented users.
The left and right arrow keys scroll the list left and right if it has a horizontal scroll bar. They also move the selection left and right in the icon modes.
By default Alt plus the up/down arrow keys expands/collapses folders.
Hmm, both Alt-arrow combinations were assigned to Go Back / Go Forward, but after i unchecked them, it still doesn't work (same with the (Alt-) num pad arrows). Also, i can't delete those two combinations for some reason, they're greyed out.
e/ maybe you mean in the tree, where it seems to work. But i ususally have the trees off.
The commands are go expandbranch and go expandbranch=collapse.
Very neat. Thanks Jon!