I noticed it the other day. There is a GetMP3milli, GetMidiBeat and a SeekModPattern but no getModPattern.
I think it would be handy when making theme music. You got the same melody but in a different tone to make it feel more sad but most of the same samples are used. If you made it in the same mod file it would save some bits.
In the game you would send the music back to the beginning when it reaches the sad theme. And when the time is right you would play that pattern in the game.
As it happens it's already on my to-do list. I'll bump it up a bit.