I recall (or imagined) there being a 2on2 ROM with the Center and Winger having slightly different ratings. I always thought that had some NES Ice Hockey potential, for composing your team for your play style. At the time, there was no Edit Lines Crash fix, so making everyone the same made sense. But with edit lines working, I think it would be neat to have some different player templates.
All players should be roughly equal in total skill, but have different "personalities" - speedster, playmaker, sniper, banger... It could take some playtesting iterations to get the right balance down.
Different personalities would/could mean disparate weights. This makes it important to consider: Will a Weight Bug Fix be added? Will the CB check be disabled?
Recommend leaving the B-check disabled (the usual when penalties are disabled. There's now a hack to enable B-check while penalties are off...)
I think you already took care to have the handednesses right, continue that. Righties have a minor advantage due to quicker spinorama, don't know if that needs to be balanced somehow with a minor nerf to some attribute...
Add Sundin, Gilmour, and Clark to the Leafs if they weren't on there before. Matthews if current players are also included. Kessel? Kaberle? Rielly?
Sundin should be a starter.
Can the widescreen patch be used on an everdrive and CRT? If not, I wouldn't do it, or would have 2 versions of the ROM. I might also not like it if it "works" on a CRT but is horizontally squished.
Instant goalie button? Reduced goalie control b-button timer? Expanded goalie roaming areas?
Put me down for Team Canada goalie, #40, Lefty glove, and I'll take a nice 6 rating on that glove if you don't mind