You can talk about issues with k-meleon here.
"Identify Browser as" combo doesn't work
Date: May 18, 2001 10:41PM
It should show the previously used agent strings.
And as an enhancement, it should default as said in another post to something like
Mozilla/5.0 (Windows; N; Win98; en-US; rv:0.9) Gecko/20010511 KMeleon/0.4
and had added two predefined strings in the combo to emulate IE and NS 4.7