Hi Nina...
The latest update for FM8 (8.0p277) fixes a bug that didn't handle conref'd table rows at all(it will now open a file that has a conref row), but it still has problems actually placing a conref to a table row.
DITA-FMx (FM7.2 or FM8) does allow inserting a conref to a table row.
Cheers,
...scott
Scott Prentice
Leximation, Inc.
www.leximation.com