Avidemux is a great tool, but it would require creating a second file I believe.
My workflow is usually to use Avidemux to do a rough trim of a clip (e.g., to take a five minute clip and trim it down to about a minute with the interesting parts in it) and get it into the format I want, then I use Kdenlive for the finer work.
My workflow is usually to use Avidemux to do a rough trim of a clip (e.g., to take a five minute clip and trim it down to about a minute with the interesting parts in it) and get it into the format I want, then I use Kdenlive for the finer work.