[racket] Scribble duplicate literals

I have basically the same problem that 2htdp/universe has -- I need to 
document two forms (from the same module) that have overlapping literals 
in their subforms.  For example, big-bang and universe both use on-tick.

The problem (beside warnings about duplicate keys when running scribble) 
is that if you go the universe documentation:

http://docs.racket-lang.org/teachpack/2htdpuniverse.html#%28form._%28%28lib._2htdp/universe..rkt%29._universe%29%29

and click on the on-tick subform, you're taken the big-bang on-tick 
documentation rather than the universe on-tick.

Is there a way to work around this?

Thanks,
David