recommend flv editor

I would guess that the reason no one else has made an FLV editor is because generally the workflow is to edit the original clip in its native format, and then export to flv. FLV might be a common output format, but I have never heard of anyone editing in that format. We use flv solely as a compressed output format for the purpose of loading our video into flash player. Editing in flv is a bad idea for the same reason as editing in any compressed format is - you want to edit the source and then compress on output to maintain the best possible quality.