Install caff (signing-party) by default
It would be good if Tails bundled the signing-party package from Debian. At the moment I use caff(1) to do keysigning on a separate machine with TAILS, but I have to connect it to the internet every time in order to install that package. If Tails bundled it, I could keep the machine airgapped.
The package and its dependencies are about 800KB to download (on top of a fresh Tails boot) and about 23MB when installed.