I have a folder folder with each subfolder subfolder1, subfolder2,... representing one calendar and each subfolder containing the events as separate ics files.

Right now I have to do

ics_task_files = calendars/subfolder1,calendars/subfolder2,...

but it would be super useful if a glob patterns such as

ics_task_files = calendars/*

would expand to the above syntax.
This is especially the case if you have many calendars or the calendars/subfolders change very often on disk.