Mark Six, as a fully licesed pilot (I hope), and independently thinking individual you are free to use the TQ limiter whenever you choose to, even to go take a pot.
It's not forbidden, just like it's not forbidden to play Russian Roulette with a snub 38 pointed to your head even though it's not smart nor healthy.
The RFM clearly states its intended use in conjunction with the OEI training switch.
If the manufacturer had other intended uses in mind, then it would have been stated elsewhere in the RFM or even the "FCOM".
I hope this fully clarify when to use the TQ limiter for you, besides the last 60 posts in this thread.