There isn't yet, but we have to choose before the end of the beta.
Your alpha/beta version on Steam will stop working the day of release.
All backers with alpha/beta access on Steam need to re-activate the game on Steam with a new key.
This was done so that you can choose GOG or Steam as a platform.
Does it mean that we can't have in both systems? If not then the poeple that choose GOG will lack mods and the editor??