Open canvas question

i've recently obtained a copy of portal graphics "Open Canvas" for producing lineart with my tablet, as my usual graphics program (paint shop pro) doesn't handle lines that well. And although I am quite happy with many of open canvas's features, there is one problem that annoys me to no end. Namely the fact that its zoom and brush size functions are the exact opposite of all other programs. I was wondering if anyone here was familliar with this program and knew if there are any customization options i might be missing that might rectify this.

sorry dont have a lot of experience with programs outside of adobe, however from what ive read 'oC' is a Japanese program, I managed to find the website ok, though the community forums where you are most likely to get an answer for your problem are in Japanese.Edit: found the eng version, perhaps registering and posting in these forums may help you out.
http://www.portalgraphics.net/oc/en/index.asp