if you want to see how toyota controls the TC lockup then have a look at the MKIII TSRM.
alternatively there is a good article here
http://www.autoshop101.com/forms/h16.pdf
as for your questions, i was wondering similar things in a thread i made last week
http://toymods.net/forums/showthread.php?t=19267
im trying to figure out if downshifting and locking the TC will provide engine braking, but alas no one replyed
if you ever get the urge to put switches on your other solenoids then it would be cool if you could let me know what happens.
one thing though, im not sure if the solenoid will disengage the lockup quick enough if you use a sense from the oem ecu. this sense would be when solenoid 2 goes from ON -> OFF (3rd to 4th on a a340e). electronically it would happen instantaneously but it would take a fraction of a section for the pressure to drop. there would be no way to anticipate when the ECU decides to change gear
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