Board Editor/From Position For Chess Variants

I think that there should be a board editor for variants as well as from position games. It would be cool replaying some games against a friend from a different position.

There is. You can find it from tools (up the screen). Then you choose analysis board. You can analyse variants and from position there.

@shakki-mestari123
I think what @Traveel is asking is how to challenge a friend to something like this:
[Variant "Racing Kings"]
[FEN "8/8/1N1Nn1n1/N6n/2N2n2/N6n/1N1Nn1n1/2k2K2 w - -"]

Except Traveel probably means actual reachable positions whereas I'm using a totally custom position as an example~ Would be an elementary #1 if it were played as normal chess, but played as a Racing Kings position Stockfish even evaluates it as a "0"; which I'm pretty sure is probably because it's a fair position though I haven't had any means to playtest it yet.

To repeat Traveel's question; is there a way to challenge a friend to a variant such as Racing Kings from a non-default position? I've looked a little and it doesn't appear as though a way to do that exists; it's not obvious in the slightest if it does exist.

See https://github.com/ornicar/lila/issues/833

@RadiantDarkBlaze ^

So... is adding the ability to challenge friends to chess variants from custom positions something that's in the plans for the relatively near future then? Am I understanding that correctly?

Issue was filed at Aug 24 2015. I don't know what is "relatively near future" for @thibault :)
But who knows... Lichess is open source, so anyone can volunteer to implement this.