well but wouldn’t that only happen if a user actually mentions the spammer? any activity the spammer themselves made would be removed along with the user. i have never seen anyone mention a spammer.
i don’t think those 404 should be bothering you. if you have open registration then you will invariably get some amount of spam registration. would you rather have google seeing missing pages or seeing the spammy profiles with links that actually could hurt your ranking? 404 errors in WMT are mainly just to alert you the webmaster that they exist. i do not believe they actually impact your sitewide or page specific ranking at all.
yes but using the terminology you already have, you are really talking about WordPress roles more then Buddypress roles (which actually don’t really exist) some of the functionality you are looking for would probably require something like s2 member to be fully automated the way you describe.
i think he platform itself will be fine but you should be aware that user levels only apply to wordpress and bbpress. buddypress itself doesn’t really use them so your moderators will be able to have extended authority in your forums but they will have no special powers over groups themselves (they will be able to moderate any group forums that are created however) only full wp admins can moderate groups (although you can assign a member to be a group admin manually as admin).
i could imagine lots of interesting metrics. posts, messages, group activities, even wordpress related things like posts. Anything that makes activity basically could make for some very interesting ways to measure a site.
i don’t think stability was ever an issue with multisite. i think the issue is that being a more complex situation it is easier to have things go haywire as an admin. I have started several multisites now and at least for me in those situations it has worked out great, granted i do not typically grant admin privileges to my customers unless they specifically request it and i usually give them a warning that the main difference between being an editor and being an admin/super is that you can break things that are way harder to fix. i think the best way to figure if it is above your head technically is to try it out on a test/staging server.
