I wanted to add this game, Cyber Shadow, to sr.c. It releases in five hours (when this post was made.) Can I request it to be added and then make a run after it releases?

From the detailed game request rules:

Well-known users or moderators of other games in a series may request unreleased games beginning 21 days prior to launch. In rare cases, requests for unreleased games may be accepted by well-known users and only at site staff discretion. Series moderators may also add games to complete a series. Games will not be added prior to release for users who are not well-known.

I'm not well-known but I will submit it anyway and hope

You might as well wait until it releases and request it with a run. It’s very unlikely your request would be looked at in the next four hours anyway.

Ok thanks! I'll do that instead