I have seen a dedicated key for ".com". It was VERY helpful and I used it a lot. I think it was on a Samsung phone that I used to have. Either way, I have searched the play store for a keyboard that has it, but was unable to find it. I really miss it and wish you could consider adding it to SwiftKey.
I believe a lot of users would find it invaluable. Thanks for listening. Good luck and God bless.
P.S. Even better would be to give us a single key that we could use to place our own dedication and be able to edit it if we wanted to change it. Again, thanks.