The addition of out of the box basic polling and historical data for the big brand UPS's (APC, Liebert etc) would be a HUGE addition and an attractive option for those with large UPS's (IE the one's that fill up a room).
-Battery Time remaining
-Temp
-percent utilization
etc etc
Yes I know this can be done with custom pollers. This is of course fairly painful and time consuming what I am talking about here is making it turnkey , just like NPM is for Cisco devices and Windows servers.