There is a setting in touchkit to make the edges more accessible. I'm trying to see if I can find a screen shot to show you were it is.
Edit: I can't find any screen shots, just go over all the settings, it's in there.
Edit 2: Download the touchkit manual here:
http://touchkit.com/m/Manual_2000XP-v4.0.2.pdf
The function is called, Edge Compensation" and it's located under the Advanced options from the General tab.