Netnames in Gnucap

Hi Gnucap developers --

One of the problems I've had with Gnucap in the past is that almost
all my netlists cause it to barf.  A major reason is that I have lots
of named nets in my designs, whereas it looks to me like Gnucap only
tolerates numbered nets (a la old-time SPICE).

Questions:

*  Is this true, or does Gnucap handle alpha-numerically named nets
and it's my head which is wedged?

*  If Gnucap only accepts numbered nets, how easy would it be to
change this?  

*  What is the variable/structure which holds the netname/number?  (I
haven't looked closely at the code yet. . . . .)  

*  Can you think of any "gotchas" which might bite if I tried changing
the netname variable to accept alpha-numeric strings?

Thanks,

Stuart