A digital pot or resistor string d to a would give you remote control, kinda gets complicated though if you want isolation, maybe an 8 pin micrcontroller controlling the pot/reg communicating to the o/p side via serial through an opto isolator.
Current limit is a little tricky to achieve without noise.
I too have used the lm2600 series, veritable ic's.
If you google elektor switching bench supply you'll find an interesting article for a bench supply using this ic, it has voltage and current control and has a microcontroller interface.