I setup an SD card with PINN, then installed RISCOS as the only OS.
When I boot, it goes straight into RISCOS - that's as expected.
However, and this is the bad part, I cannot get control via the "Shift Key hack". I have tried several times to regain control via holding down shift during the boot, but it always goes directly into RISCOS. It seems the only way I can regain control is to rip the card out and start over from scratch (re-install PINN).
Not sure if this problem is limited to RISCOS or to PINN or if it is generic NOOBS.