I use a bluetooth keyboard w/ gnumeric, but one of the "pains" is you have to select the formula bar (yes with you finger or stylus)before you start typing. It doesn't quite work like Excel, where you can arrow over to a cell and start typing. Unfortunately, my BT keyboard doesn't have a F2 key (like you'd using in Excel to edit a cell / formula) & I haven't found a non-touchscreen way to get into this mode. Try hitting F2 on the PC/VNC keyboard to edit a cell, but since I've never used gnumeric on a PC, I'm not sure if this will work.