Is it possible to record with microphone in OpenMPT?
No, but it may happen at some point in the future: https://bugs.openmpt.org/view.php?id=501
I have for the longest time wished to be able to record audio in the samples editor.. imo, that would make MPT a complete DAW. even to alow for recording 1 min of audio is enough..
The other thing.. horizontal scroll/tracker window option :)