The load times for the N64, Wii, and WiiU are all very close. Your run will only really notice much a difference if you play on emulator.
I'm not 100% on this but I do believe that the "All Characters and Espers" isn't a official catagory yet. With enough interest maybe one day it will be.
I would think that all monsters would be good enough... But I guess it comes down to what everyone wants
You might want to try to contact either Leonis07 or Nickynoel for some good notes for the run. I personally like to just watch a run for an idea of what they do, then just do my own thing and even try my own route.
It becomes much more risky for many reasons. First no cure spells, less hp, worse weapons and armor. For your first few times try the rdm out and after a bit try a blm out when you're comfortable with the route.
You can also watch the 1st, 2nd, or 3rd place runs too see three different routes you can use.
Sorry for the late response. I haven't been on here much lately, I'll add a new category. All characters isn't possible and neither is every class thanks to the unique characters. Every stage is a good start though, and I'll be sure to be on here more often again and maybe get my capture card working on try some new runs myself.
If you do a run with any rules you like I'll add a category for it. There isn't much for runs yet so anything goes for now.
I was thinking complete every stage would be 100% There are 43 stages I believe and I planned to doing a route with every stage completed one I get a better any%
I play on the NES and it's even harder than the PSP version. I lose 95% of my runs before I finish the ice cave. Times in the game can swing so much from one or two unlucky encounters. When I hadn't finished a run I would compare myself to my average splits. That way it's easy to see a mix of green and or red, not just red splits.