It would be nice if Group ONLY Sign-up for a particular Opportunity was an option, for projects that require groups (with the option to filter how many are able to sign up).
Hi, Holly! Thanks for the suggestion! This has come up before, and I've marked it for further discussion at our next enhancements meeting. It has never made it to the enhancement stage because our coding prevented a "teams only" option (or it would have required a major rebuild to allow it); however, that was quite a while ago, and it's possible that things have changed since then.
Thanks again for posting!