Consider that GIS software is fairly CPU and memory intensive, and without specially prepared datasets (like Map does), it will be very, very slow. The missing/emulated FPU is not helping either for all the float vector operations. Maemo mapper (and qmapper and...) gets around this by using preprojected raster files (so the actual calculations, transformations and clipping of the original dataset is done on the server side). Thus, while probably doable, I don't think the result would be too appealing