I provide bluefish packages made from CVS, which contain the latest features. If you want to test the latest bluefish version, then you can install the bluefish-cvs package in additon to a stable bluefish Debian package. Both packages use their own files and directories, so you can do relaxed testing of the latest features. Please note, that the development version is maybe not stable and may crash at every moment. The packages are located in the experimental tree of my Debian package repository.