Gary, thanks for your feedbacks.
`empty-group-time-to-live` - np, I'll change it, when other agree.
deprecate `setMinimumTimeoutForEmptyGroups()` - not agree. It was introduced in the 2.2.GA: https://jira.springsource.org/browse/INT-2832
So, I don't see any problem to raname it, the more i'm not sure that someone used this property before... Of course we should mention it in the Migration Guide.

XSD docs will be improved after approving other changes.