Tree navigation shortcut keys

I'm guessing that this is a fool's errand, but here goes ....

I'd like to be able to customize the keyboard shortcuts for navigating 
tree structures (eg. the filters in the Remote Systems view).  I'd love to 
be able to navigate the structures using only the keys that are easily 
reachable from the "home row" position.  I know that all the printable 
characters are used to navigate to a list item that is prefixed by the 
characters typed, so using straight alphabetic characters is out.  I don't 
like jumping to the arrow keys or the numpad to expand/collapse tree 
nodes, so I'd like to have something like Alt+L to do the same function as 
the right arrow key.

So given my goal, I guess my questions are as follows:
1.  Are there existing shortcuts to do this?
2.  Does RSE/Eclipse simply pass these keys to the OS, or does it handle 
them itself?
3.  If passed to the OS, does anyone know of a way of customizing Windows 
shortcuts?
4.  If RSE/Eclipse handles the keys, is there any method to modify this 
behaviour?
5.  If the answer to 3. is "no", is there a possibility of adding this in 
a future release?

Sorry if this is a bit esoteric, but I hope someone on the list will be 
able to shed some light.

TIA,
Adam

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