It would be very useful if a less than mode could be added to LSNS, TSNS, and PSNS.
So for example you could set the TMP1 of TSNS to 1 and it would change its behavior to "less than mode" (Like how FILT modes are changed with TMP1) and it would then output sparks whenever it detects something nearby with a temperature lower than itself.

Having both a greater than and less than mode would allow you to construct a pseudo-comparison mode (=) using two detectors and an AND gate, which would in turn allow for the construction of sensor systems with higher granularity and range all while using less detectors.

Yeah I was just testing that, the wiki confusingly says that plain tmp is used for range.