musixflx and the last incomplete system

[Alexander V. Voinov]

Hi All,

1. Is there a manual on musixflx, and are there command line options for
it at all?

2. Is there a way not to spread the last incomplete system, which may
contain one or two notes, over the entire staff width?

Yes, I understand that I can rearrange previous systems to incorporate
these two notes into them, but suppose it's impossible.

Thank you in advance

(The TeX fed to musixflx comes from PMX, I _have_ to pass it to
musixflx, right?)