Description of problem:
I have developed to my jetpack script (http://git.fedorahosted.org/git/?p=triage.git;a=blob_plain;f=jetpack/bugzillaBugTriage.js;hb=jetpack look around function parseBacktrace) which parses attached backtrace and provides to the comment box most relevant part (if available). See bug 541173 comment 3 for an example.
I guess it could be useful if abrt provided something similar automagically. Maybe shorter? How many frames are most useful?
And no, I don't think should REPLACE attaching full all-threads backtrace, just SUPPLEMENT it. The attached backtrace should remain, IMHO.