While Lardy may not answer, lots of people have been to his seminars where this subject may have come up.
Ecollars with both momentary and continuous were in use at the time the videos were shot.
I was at a Lardy seminar, and it did come up...I don't have any notes about it, though.
I have a vague recollection of a discussion about differences in old vs. new collars. What I'm recalling is that, in the old collars, you could not emulate a "nick" using the continuous setting because you had to hold the button down awhile to transmit the signal. If you did a quick press of the button in hopes of a nick, most likely the dog would feel nothing. If you pressed the button long enough to transmit the signal while in continuous mode, you got something much more than a nick. So you had to use the momentary button on the older collars, but the newer TT collars do not have this limitation. Does this sound plausible?
Edit: Oops...I am wondering if the way I remember things is plausible (not if something Lardy said is plausible).
Mitty, When were the seminar? That sounds like real old technology on the ecollars.
I don't recall the comparison of old vs. new collars, however at one point I believe what I saw Mike do at this June's 2 seminars was demonstrate nicks and burns using the continuous setting on a TT Pro 500; the "burn" he demonstrated was a revelation, at least to me, in that it was much shorter than I had thought; just a press-paaause-release and the "nick" was a press-release.
Someone's dog wasn't responding to the ecollar, and there was a discussion about the ecollar not working right...and the old vs new collar stuff came up. At least this is what I remember.
I found the answer to part of my question. On the bottom of page 18 of the booklet accompanying the TRT dvds outlined in a box under Collar Fetch: "As with stick pressure, the nick does not get applied on every fetch sequence. Using a collar in the momentary mode works well for collar fetch, as you want the nicks to be very quick"
When all else fails read the directions.
Since he made this distinction on collar fetch, I assume that indirect pressure on three handed casting would still be in the continuous mode.
When I attended the Lardy seminar this March in CA a bit of this discussion on continuous vs momentary also came up. My notes and memory are clear on this subject. Lardy said BASICALLY he does not use the momentary function of the TT collars (he did NOT say he never uses it). For a nick, he taps the button on continuous. Also had another pro tell me not to use the momentary for a nick type correction because the stimulation the dog feels is so rapid it can make them jump or kinda de-stabilize them. The pro also told me to tap the TT (I have a TT 500) in continuous mode for a nick. Just figured I would offer this up in the discussion.