Yo, WW, I do believe that John-o did a UY/Ranma crossover thing.
It was written some time ago, I think one of his earlier fanfics.
He had Ryuunosuke dating Tsubasa and Akane gaining some kind of
distance punch.  Also, Shinobu had a crush on Ryoga.

And yup, Ataru chased Ranma-chan.

-Rod M.
  p.s.  Yeah, I had an Ataru cameo in TMTC too....