scangearmp2 can scan from my Canon Pixma TS5150 but only basic scans

I have installed the scangearmp2 tool to use my Canon Pixma TS5150 scanner and I managed to get it working. But unlike some screenshot I've seen it only provides a very crude interface. It can only scan the entire page in 300 dpi, no preview and no other options. From xsane I do get a preview but any attempt to select an area to scan is ignored. Resolution is listed only up to 300 dpi and it only uses 300 dpi as far as I can tell. Is this not (yet) supported for this scanner or am I doing something wrong? I am running Linux Mint 17 (Ubuntu 14.04). By mistake I installed the 32-bit OS but I assume this doesn't matter.