The only keymapper that planeshift has is keys.xml in the root installation directory (eg C:\\\\Program Files\\Planeshift)
As far as your description goes, that is a keymapper.
To change the keymapping, just edit the file in your favourite text editor and type a new key instead of the old one in the \"Key= \" position. The \"Value =\" bit describes what the key will do.
Then save, exit and restart planeshift.
One big don\'t: Updating using the updater.exe will reset the keys to the defaults.
I don\'t know how to post an image so i\'ll link to it on my site instead. (The Homepage to Be of the Casusa Guild).
http://www.swift.4hv.org/keys2.png(the link might not work straight away)