Our 11 month old has gotten fairly good at knowing what she may and may not touch around the flat (e.g. a dangerous table, curtains etc.). When she approaches or actually gets her hand on such stuff, we tell her "no", move her or the thing, and offer an alternative. This has resulted in her looking at the forbidden things and apparently deciding to go somewhere else.
However, when it comes to biting into the table at feeding time, this approach has not worked so far. We move her head away from the edge and tell her "no", but offering a real alternative has escaped us, which I suspect why it is failing.
When she is picking up food and eating it herself, it is basically a non-issue, so maybe boredom is involved. However, feeding faster can only go so far (not to mention its negative aspects) and turning a meal into fun-play-time also seems counterproductive. We encourage and laud proper eating, but it seems to be an insufficient alternative behavior.
We had a similar issue with a placemat that she would begin to "peel off" the table and eventually flip over (with everything that was on it). On that front, we caved and no longer use it. I would rather avoid a similarly evasive solution, such as feeding her away from the table, because I suspect that she would transfer the behavior to the high chair she is sitting in.
What to do? Continuing and hoping that the "no" catches on eventually? Introduce consequences such as stop feeding or take a break? A possible issue with taking breaks, that I am anxious about, is that she may learn that her complaining will lead feeding being resumed.