You named exactly what I feel is mising in the Duncan line-up; a Switcher! Like Boss’s effects looper. A device into which you can conect all your individual pedals into and program some patches. I bought Mooers Switcher this past December and it didn’t even last one year (neither did their reverb), so a reliable US made one would be great for every one who has more than 5 Pedals.
Another item we all need (this year I blew a Chinese made one) is a powerstation, one which will give us the voltage it mentions.
Personaly I think multieffect units are not my thing, I preffer 5 good fx than 20 lame ones.
EDIT; by powerstation I meant power supply.