Allpar was something else.
It used all files in the download folder during a par2 run.
The advantage is that odd naming schemes are no longer a problem,
the disadvantage is that every par2 run will be slower.
I haven't made up my mind about it.
Some of the things already landed in 0.7.0 (like using the base par2 file
and sending the vol-par2 files immediately to the end of the queue).
Optionally always downloading all par2 files is on the roadmap.