Suggestions

I think we should add more chess variants, and chess fairy pieces, Shogi stuff, and allow creation of custom chess pieces or like, a service for premium users (or even free users) that allow sort of like, a mod library that allows us to download custom chess pieces with custom movements and themes and stuff.  they have to be approved by a moderator of course   because I want to play many variants of chess, or with variants of chess pieces that aren't on the website Such as the fire demon, the Emperor, The Igui, etc.

we should also allow custom sized boards, or custom rules, but I can see how that would be a nightmare to implement 

Not really. I have already programmed something that goes a long way towards doing that, just for fun: the Variants Play-Test Applet. It allows you to specify board size, also for irregular sizes with the aid of 'holes', and put a great many pieces on those. The moves of which you can alter into almost anything (leapers, sliders, riders, hoppers, bent sliders, bouncing pieces, side-effect (multi-) captures. And as to rules it can handle multiple royals, the baring rule, winning by arrival at a square, automatic promotion/morphing by reaching a square or capturing a piece of a certain type.

And it even contains an AI that you can then play against.

I dont know what any of those movement descriptions mean

You don't really have to know that. For one, you can click on the name of the piece, and you would see what it means in the move diagram this summons, at least on an empty board or a board with one enemy piece (which you place by hovering over the diagram).

Furthermore, for the orthodox pieces you can assume that it represents their usual move. For the other pieces it will likely represent the move that is commonly associated in the chess variants community with the piece of that name. But when you don't know those it is very unlikely that the image you would want to use in your own variant would be listed in the table with the move you want to use. So you would have to redefine the move, and you can use the move-definition aid on the page to indicate how you want it to move on a board, and this will create the move notation for you.

Finally, if you want to have really complex moves, like bent sliders or multi-capturing pieces, you can read the page where the (XBetza) notation is explained, to which the Applet page links..