I would love to see much better multi-threading support.
I think it should be prioritised over a M1 version, as it will benefit both intel macs and M1 machines running VSL with rosetta.
A M1 version without better multi-threading will still have issues.
I have learnt to live with the current situation and still very much enjoy my VSL virtual pianos. If you can, limit yourself to just one close mic. If you do want to use more than one close mics then set Sympathetic to -inf.
I am able to add any number of non close mics without a problem even with Sympathetic not at -inf.