On the main page I saw some news about Doom64 EX, something I had not heard about until just now. After reading about it it sounds like it's a new editor to make custom Doom 64 mods, just like how Doom Builder, along with Slade3 and XWE, can make mods for the original PC Doom games and other such PC games.

I have read that Doom64 EX can also create custom textures and graphics for Doom 64, which raises my main question. If this editor becomes fully complete with their bugs being fixed up and 100% ready for use will Realm667 consider giving a new section for Doom 64 custom demons, weapons, textures, etc?

Doom64 EX is a source port for playing Doom 64. You first have to run the ROM through the WadGen utility, which is included with Doom64 EX.

It is not an editor. It's a port.

You can use Doom Builder 64 to make maps, though. It's a fork of Doom Builder 2.

Finally, you can use SLADE 3 to work on Doom 64 stuff. Not maps yet since the map editor isn't completed, but to package sprites and textures and stuff. Doom64 EX uses plain PNG graphics just like ZDoom can.

Eh, i dont see why D64 monsters cant be submitted along with others that dont go DOOM looking if there was simply a "Others section" for the hellspawn, like for textures, weapons, etc.

Who knows? There have been D64 weps submitted, why not the monsters