Deleting events

[halfway]

I'm using IF_UP and IF_DOWN to trigger a perl script so different interface types are handled differently. The problem is each time an interface goes up or down I get 2 alarms, an IF_UP/DOWN that goes to an overhead(garbage) category and a custom event. Now I've been given the task of accounting for when async backups are up/down since our clients will whine if an isdn backup stays connected (which is understandable as they get charged by the minute for it)

the problem is the interface is dormant when its not connected (OV_IF_STATUS) shows it as unknown when it goes dormant but it doesn't trigger the OV_IF_UNKNOWN event)

which means I may need to keep the IF_STATUS event on as well which will give me roughly tripple the number of events filling up the browser all that much faster. I've tried only using the IF_STATUS for all interface status changes but for some reason events slip through when I get a bunch at once and the automatic action doesn't trigger correctly.

Are either of the following possible?
When the log gets full delete events from a specific category, or first delete events with a specific snmp trap

Have an automatic action trigger from an event that is set to log only so I don't have to display those events at all

Any other suggestions would be most welcome

running NNM 6.31 on Win2k