Hey William,
I retouched the deftable documentation a bit, hopefully making it clearer. There was no facility for directly cleating unique indices from deftable, but I have added a patch to the repository that makes this possible -- using "(:unique field-1 field-1)" instead of just "(field-1 field-2)" after the :indices keyword.
If you have any specific suggestions for the docs, let me know, and I can incorporate them.
Cheers, Marijn