I'd like to see LF_NETBLOCK extended to work like the LF_[application]_PERM triggers, where this can either be a permanent or a temporary ban of a configured length.
Additionally, I'd like to see CC_LOOKUPS info included in the LF_NETBLOCK alert.
Both of these changes can go a long way to help prevent/detect issues where a netblock that impacts legitimate traffic gets blocked, and some intervention is needed, as the messenger service won't allow an unblock of a netblock.
On that same topic, I'm wondering if there's a way to advise clients getting the messenger page when their netblock is blocked that they will have to contact the admin for removal. At first glance, the only way to do this is to do a somewhat costly lookup when the page is submitted.