@Sedge Hmm, I may have. Right now I'm only remembering how much of a hassle the PS2 port of '94 was to do stuff with. <shudder>
I'd say with '96, the most fiddly bit was the fact that in some cases you might need to put a team with a long name into a spot originally occupied by a team with a short name. And unlike wboy's '94 mod with its standardized name bars located in a single spot, these names and logos are spread out and only allotted enough tiles to accommodate what was required for the original team.
The other more minor issue that stands out is that the main menu is configured differently, so NOSE doesn't know how to access the data to edit it. The only thing that makes this a problem is that you can't set the default match up. There is also the team ranking system, the simulation AI, playoff team selection and everything related to season mode, but I'd like to think that with enough will and time, most of that could be cracked.
With the exception of season mode I suppose, given that we know how to edit a season in '95, but it causes major memory issues when you try to incorporate the additional teams into the mix.