configuration possibilities to limit size of local repository

it would be great to make repository-size configurable, for instance by setting the maximum number of downloads of a snapshot-version to be kept. thus the explosion of local repository size can be reduced.
especially when you are working with many in-house multi-module projects which are marked as snapshots before released , can increase repository size significantly.

see mailing-list discussion: http://www.nabble.com/limit-size-of-local-repository%2C-limit-number-of-snapshots-td16147475s177.html