Could there be a bit of reputation leakage between the sites, please?
With the number of sites growing it would be nice if privileges up to a rep level of 50 were awarded across all sites. If I pop in to Superuser or SharePoint it would be nice to be able to comment everywhere.
The sub-50 permissions seem to be designed to keep new users from abusing privileges before they understand the community. Once you're established in one community you know the ropes and should be able to contribute to the others without the time-out.