XTrmXJ
NACHHOOOOOOO!!!!
I've contemplated rigging up a hand throttle for my Jeep, but that's a little easier application as its EFI and I'd just have to rig a cable to the throttle body.
EDIT: I know in my Jeep too I can very easily maintain 5-10 mph by just kicking it into 4Lo and idling.
For your Jeep all you need is a bicycle gear shifter... I can bearly hit 5mph in low range with my foot smashed on the throttle in my XJ