You can talk about issues with k-meleon here.
URL copying/pasting in 0.3
Date: March 09, 2001 11:46AM
can't copy from / paste into the URL field.
RE: URL copying/pasting in 0.3
Date: March 26, 2001 08:38PM
Fixed in the upcoming version 4. If you are impatient, you can try it out from the CVS repository (there is a binary version called kmeleon_partial.zip in Contrib/binaries) in the sourceforge CSV repository for KMeleon. Download it and put the exe and DLLs in teh bin directory of a recent mozilla nightly.