I think that a tag team "Ultratitle," as it were, could possibly be the most effective way to step up tag team competition on FWC. One of the major obstacles toward tag team wrestling has always been pride; the tag titles are never viewed to be as prestigious as the World Heavyweight title, or even as prestigious as the other singles titles (with the possible exceptions of specialty singles titles, like Cruiserweight, Hardcore, Women's, etc.). Therefore, being at the top of a league's tag division is akin to being at the bottom of its singles division (this is a concept I became intimately familiar with during my run as ALMIGHTY LORD GOD~ of the FWF tag division a few years back). A lot of the top RPers (with a few exceptions) focus on the more-respected singles titles, meaning that not only are the numbers for the tag division decreased, but the division also becomes stereotyped as a place where the less-skilled RPers appear.
Having an FWC-wide set of tag titles, though, would provide FWC with a set of tag titles that is, in effect, just as important as an individual league's World Heavyweight title; it makes the champion the best of the best, instead of the best of a league's limited tag division. I think it would encourage handlers to create tag teams to enter or join forces with other handlers to ally singles wrestlers. Basically, it would have all the entertainment of tag team wrestling with none of the stigma. I like it.