I'd much prefer 3.x over 5th edition rules. 5e is hot right now in many ways because it is streamlined and more accessible, but one of the main advantages of making a computer game is that so very much of the complexity is easily handled by the computer for you. Honestly I really miss 3.x's weapons and armor for example, or stuff like touch/flat footed AC, or having monsters and PCs play by the same rules.
That being said, redoing the game in 3.x ruleset might be beyond the capabilities of modders. Certainly something that would be quite the undertaking of one or more seriously dedicated and skilled modders who had a strong enough desire to see the game modded into 3.x.
