change working directory for illarion?

[HeXiS]

is there a way with out uninstalling and then reinstaling on both user accuonts on my WIN XP HOME to change the directory that illarion uses :

from : My documents

to: shared documents or whatever i want..

or do i realy have to uninstal it on my primary account i ask because some times i play ill while im working and i dont mind the system lag.. but other times i have time critical moments where i need to not lag lol.. so i have two user accounts one is for working while playing the other is just for speed.