Reaper auto-updates external midi data, but the tempo data does
not get updated upon refocus, and it seems that it should or, when tempo variations have been noticed, inquire from the user if they would prefer to update tempo mappings into the project starting at the beginning of the media item.
Even a manual option of "Reload tempo markings from external midi file into project starting at beginning of the midi item's source time of 0:0:0" would be nice.
Hope that makes sense. Tried to have a discussion about it at
https://forum.cockos.com/showthread.php?p=2202031
Any feedback would be appreciated about this, or more detail of a workaround if anything at the discussion thread.