Is there anyway too add websites to this platform so that they can be streamed?
Which website would you like to be integrated?
Crunchyroll.com if that is possable. I know there might be an issue but, if that is possible you would be doing the anime watch groups a big service.
I can only add websites directly into Watch2Gether when they provide an open API. Unfortunately there is no such thing for Crunchyroll. You can try using W2gSync though: How to use W2gSync