User App 4.02C, on SLES11 in JBoss, and I want to look at a Role that
has 2400 assignments.

I set the paging value to 25 by default, and I get the error Query Limit
exceeded, please setup a filter and retry.

I set the paging to 500, no joy.

Can I control this value? If the query limit is ignoring the paging
selection, what is the point of paging?

The filtering is not helpful, since you cannot wildcard filter. Only by
specific users. Or by Assigned due to User, Group or Container assignment.