What are you getting at? You can shift any type of (manual obviously, for the smart asses out there) tranny without the clutch, and it's not easier with a sequential. You still have to be at the right RPM to properly engage the next/previous gear, unless you want to shorten the life of the synchros or dog rings. I'm assuming you're talking about a sequential tranny with dog rings. Have fun living with that on the street. You could also get a synchro'd sequential, but it's not the greatest idea without using the clutch unless you're good enough to not need the synchros.
Really the answer to your question is to not worry about your gearset type unless you're making enough power to break your current tranny..