Here's some suggestions:
1. Make it so you don't need to install the fonts to view them. (Yes, I am too lazy to take 10 seconds off to install them and I'm sure others are too)
2. Add the ability to go and add screen width/height without it modifying the Graphics module's screen width/height. (I'll explain this better if needed)
3. Add the mystery gift option to the title screen (simple as that)
4. Add the ability to create Pokemon (or edit them) through the editor (this includes all the other PB data not implemented yet to the editor)
5. Make the Tileset Editor (in the debug editor) keyboard operated instead of it's current Up/Down/Left/Right changing
6. Add some more move animations (at the very least the images which can be used to make more animations)
7. Add the R/S/E Game Corner mini game (forgot it's name but it's the one with the thing that spins and you try guessing in which category the ball lands in)
8. If my memory serves me right, didn't G/S/C also have another mini-game other than the slots? Anyways add that too.(I can't even remember how it works so no explanation really)
9. Battle Pyramid (Ok, this is possible with a small amount of effort and knowledge about the battle tower scripts + dungeons)
10. Pal Park (Eh, I don't care about this too much in the end)
11. Save Encryptions (I have already made a few of these, but it would be great if everyone could encrypt their saves so no-one can hack the games like that)
I have more, but I can't remember them...
You don't want much, do you?
1. The whole point of fonts is that you install them. If your only reason is that you're too lazy to do even that (Essentials does it for you!), then I'm seriously not going to even consider researching whether your proposal is even possible.
2. I don't know why you'd want to do this, aside from including a border. There you go, actually: borders used to work like this, so you can have a look into it yourself.
3. Essentials doesn't have a Mystery Gift feature.
4. I'll look into it.
5. Umm... Up/Down/Left/Right IS the keyboard.
6. There's a thread about making more move animations, which is of course dead. Go revive it. This is too trivial to be on my To Do list at the moment.
7/8. The Roulette (RSE) and Card Flip (GSC) are functionally the same game. Anyway, creating yet another mini-game is very low priority for me right now.
9. I don't know how it works, and the Battle Frontier scripts are a mess. I can definitely say I won't be doing this (someone else might, of course).
10. Please tell me what possible use the Pal Park might have in Essentials.
11. I'm not big on the encryption front, so I've not looked into save file encryption. I don't know if it matters much, as one person's game can't possibly interfere with another person's game anyway.