Or just get an HighWay (or SubWay for the A1200) and use an
USB-Mouse. Won't work with selfbooting games and won't be
available in the early-startup-menu after a hard reset (but
will be there after a normal soft reset).
But is 100% perfect for WB-use and you'll get lots of extra
posibilities (USB-ZIP,scanner,printer .....) "for free" with it.