I guess this is not really a bug but a bit of a design limitation...?
I have a saved setting for an empty path, which resets all the MOD-related settings and other stuff to defaults, so that modules sound the same everytime I play them, no matter if the previous module was using non-default interpolation settings, etc.
However, I would like to extend those to xmp-openmpt as well, and it is not possible to create another path settings for an empty path. XMPlay won't let me do that. So what I'd need is the ability to specify my default settings for more than just one decoder.