Any updates about RiscOS on the Raspberry Pi?

Well actually it was the other way round, the mouse pointer had to be below what I was aiming at by about the thickness of a window bar. This is what I set in the config file:-
overscan_left=-2
overscan_right=-2
overscan_top=-35
overscan_bottom=-24

Yep, that should be fixed now – try grabbing the latest development ROM and see what happens.