Yes. I was *almost* set up to use Tragesym (it took quite a
while...ever try to get gnumeric built on anything other than Linux
on a PeeCee?), then DJ released djboxsym and I was generating symbols
literally in minutes. I believe it is the single largest usability
enhancement to come along for gschem in a very long time.
Using gnumeric is just an easier way to edit table-like data. Every
other spread sheet program can be used too. I usually just use a text
editor.
For large symbols with more than 64 pins a spread sheet program may be
faster, especially if you can copy some of the labels out of a
datasheet.