Yes, that is definately possible. I should add an optional parameter to the /censusplus prune command to allow for custom pruning rather than only allowing 30 days. Perhaps I could also allow pruning based on level if that would be beneficial?
Honestly it wouldn't really effect results here unless everyone did it for that server/realm. As long as I did get some submitted data, chars would still be updated.
And the player activity comes from a different set of data so that wouldn't be impacted.