Most likely not without root, as that means you will have to modify network adapter properties. In my limited experience with full blown Linux systems, that's something that always requires root access. I'm not sure of any app that let's you do it though, short of doing it through the terminal, since its very rare that you ever have to disable IPv6.
I know its not impossible. It looks like there is an option to disable it under '/proc/sys/net/ipv6/conf/wlan0'. wlan0 text could be replaced by any other interface.
One thing IS for sure, is that you will need root.