Click to select and move with arrow keys could be OK Oh god no. Like you already state, most people operate both the mouse and the arrow keys with the right ha

Click to select and move with arrow keys could be OK Oh god no. Like you already state, most people operate both the mouse and the arrow keys with the right hand, so your proposal adds a lot of unnecessary movement. It could work with click to select and with WSAD keys, but most office users wouldn't discover that mode. I would much prefer navigation keys (arrow keys, page up/down, home, end) to select, shift+navigation keys to move.