Um... I hate to usher, but how high is this on your to do -list?
Sometimes I need to export a looping wave, and this requires me to disk-write the tails of all the instruments (fadeouts, delays, reverbs), then cut and mix them to the start of the sample. If a Marker was inserted to the .wav file at the end of the song (marked in the Sequence by me, of course), it would make this process quite easy.
Could also give an "Insert Marker between each pattern" checkbox option in the Wav Export menu? On wav export, it would then automatically put a marker between each pattern, and in an ideal case it could also add the pattern number and name in the Marker name (.wav metadata supports named markers and regions).
I already know you can give patterns a name, but I practically don't use that ability, because you must click a pattern in order to see it,
I find it very useful and use it a lot. The pattern names are also visible in the Tree View's Sequence folder, making them very easy to browse.