Heh, been fishing for the ranking myself just yesterday and today... for the second time ever (not sure how I always missed it before... but anyblue... moving on...).

While I sort of agree, I wonder if I would get annoyed by the delay it would possibly induce (after synthesis, the 'tooltip' you speak of needs to be sort of cancelled out before I can get back to my inventory).
It probably wouldn't be too bad, but I'm not sure if I would find it too useful in that, unless the fish is very, very worthless, I'm likely to keep it anyways, and I would fish up a bunch before checking on them.

All in all, I think I might not mind it. ^^