Suggesting more account types to "Sign In With"

There's a few OAuth accounts I use to sign into other websites that aren't on the list, and the picker doesn't let me pick any login item. For now, I'm just linking the two items, but I'd like to either be able to pick any account or suggest more somewhere.

Some examples of missing account types I use regularly to OAuth:

• Blizzard Battle.net (used for e.g. Wowhead)
• Steam
• Twitch

Can you please add these? And how do I suggest more? Through a forum topic or is there some specific place?