command index vs. unified index

[Graham Percival]

I've been investigating producing an index of commands, but it appears 
that texinfo can only use each @findex once -- if I have an index of 
@findex entries, then those entries won't appear in the general index 
(despite my using @syncodeindex).  I've asked for help on the texinfo 
help list,
http://lists.gnu.org/archive/html/help-texinfo/2006-05/msg00000.html

If it's impossible to use the same @findex entries twice, should we 
keep our single unified index, or should we split the \commands off 
into their own index?

- Graham