Craig,

People have tried that in the past and, yes, it can be done.  The Lignomat control system can tell you about the shell and core but a capacitance system could also tell when the wood reaches 30%.  These don't use lumber temperature, however, except maybe to correct the meter.

In your question, you ask "with normal kiln control."  I suppose one could calibrate the TDAL for that purpose (for a given schedule and product).  Often people just use it for end point determination, but it can (and is) correlated to MC in some control systems.  Again, this is not lumber temperature, it is the air temperature.

I would say the most effective way (of using wood temperature) is to place a thermocouple or other sensor at the center of the piece.  This involves drilling, putting in the sensor, sealing the hole, and placing the board(s) in a representative location.  The surface of the board will lose the free water first and the surface temperature rises first, then the mid layers, then the core.  The temperature rises at the core when the free water leaves the core.

To make the measurement easier, cameras can be used to detect the surface moisture content.  This might be done with visible, NIR, or IR, light but the surface MC.  Surface MC, however, can vary a lot with conditions and with the previous wood handling.

Not sure if that's the whole answer, but it's what I have.  And, no question is a stupid question except the one that does not get asked.

Mike M.