Hey guys! Kinda new around here. I was referred to give this a check. I've gotta credit you, FireMario! This is brilliant!
I've only read over most of what'cha got down and -- if I may, I've gotta thing or two that I'd like to add!
(Apologies to anyone who may of mentioned these someplace in here or if it's known of or anything, just thought I'd try and help out.)
1.) Reverse Upsmash: It's sorta like a sliding upsmash, only this might actually come in handy. Basically, as you dash forward, you've got the option to jump-cancel straight into an upsmash, only backwards! This is actually very beneficial for many reasons.
a. Mario's upsmash begins from behind. You'd be quicker in striking the opponent!
b. You're facing backwards. Waste no time and do a quick bair/uair and throw the opponent into a combo if you choose to do so!
How to perform: Dash (you don't need to keep running) + jump & A.
2.) Reverse Cape: Pretty sure that this might of been referenced someplace, though I've found it upon my own discovery. It's almost as though you're going to cape straight off a platform, except the momentum is reversed! If done successfully, you'll wind up caping across platforms to an extent depending on where you are.
i.e. Halbred's platform allows you to cape all the way to the other side of the platform. Might come in handy.
i.e. Stage platform's only have the ledge to work with. If done successfully, you'll only shoot some distance forward, almost as though you're doing a dash + analog tap & fireball/cape. Sometimes, it will even glide you a little off the edge, and then you'll just automatically grab the ledge.
How to perform: Exactly like caping off a stage, only you'll want to tap the opposite direction just as soon as you leave the edge, as well as cape.
Here's a tip for those of you who are determined to cape glide off a stage successfully if you're having trouble: Grab the ledge, roll back onto the stage and from that exact point, try to cape glide from there. You're not traveling to your full potential, but you're definitely traveling far from the ledge! I found it to of been a much easier way to cape glide.
Once again, I am just sharing these with you. I've discovered these on my own, though I am not attempting to gain credit from this. I apologize if it's been referenced before and I hope it helps!
**EDITED** Ok, now that I've spent a while looking around, it's become apparent that this has already been discovered to an extent. My bad, fellas. Spare the forum noob!