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This is illogical. How would you implement it? (Esp. in
cross-platform situations...) It's *possible*, but
pointless, and wastes cycles. How would this be used?
Remember, that this is the *default* behaviour in many,
almost ALL MIDI applications, including Windows and Linux,
unless the hardware allows you to use multiple opens, in
which the hardware would play all songs simultiously.
More details of the expected behaviour would be needed, also.
Remember, this is an open source application - I'd
suggest that if you're looking for a specific feature, that
you look at the source and see if a) it's feasible, and b)
how it would be implemented -- you could always write the
code yourself.