afaict, there's no dedicated .sfz editor app that i know of yet. maybe
there are. you always have as last resort to edit one as plain text, taking
care to obey to syntax and semantic rules (ok, sorry, this is just me
thinking out loud, because i know this much about the .sfz spec:)
and yes, there's a linuxsampler mailing-list and also a forum. also
#linuxsampler on
irc.freenode.net . i believe most of your worries are
best answered by the sfz engine's author(s) hanging out there ;)
I think I vaguely remember someone posting a script to create sfz files to
this list but maybe that was to create Hydrogen files? Once I have got a
working sfz (I should've just downloaded a free one instead of trying to
make one myself first really) then it'd be easy enough for me to write a
script to automate the creation of sfzs but I'd still prefer to see such
functionality integrated into qsampler, gsampler or fantasia - my philosophy
being that if we want to stand a good chance of attracting non-unix geeks to
Linux audio then all common tasks should be achievable without any scripting
or cli voodoo.