I too had the same idea about a DPS+interrupt barbarian. There are a lot of things I dont understand though.
The interrupt value for example. It has a value that is defined in seconds. It makes me think it interrupts that long, or otherwise I have no idea what it would measure in seconds.
If the interrupt value of a weapon does not add to the chance of an interruption only the precision and tallents, than it doesnt matter what weapon I use.
About the stats I thought the best DPS+interrupt barb would need high might, dexterity for attack speed, and precision for interrupts. Intelligence is pointless since you are going to hack people up and not shout at them.