Add more Hotkeys please.

Hi, I would like to ask that more hotkeys be added, as fiddling with mouse to select multiple files can be frustrating!

For example, a hotkey(s) for 'Mark Selected/Unselected'. Perhaps Plus and Minus on keypad?

Or better still, user selected!

TIA

EDIT: Ok, so I found that I can move up/down the list with the up/down arrow keys (doh!), and SPACE selects/deselects the file. My Bad!