This is a great plugin! If one improvement were possible, I think I might be able to use it in my projects.

The problem is that largescale SML developments typically have a number of different CM files, and usually it is only correct for the IDE to try and load a specific one of those; indeed, sometimes we may even design a CM file specifically for the IDE to use (to the exclusion of all others!).

In particular, if you are using path anchors in a CM files, the plugin may cause syntastic to load a CM file that has an unbound anchor, rather than the master CM file that sets this anchor.

In the SML mode for VS Code, we allowed users to have a little configuration file at their project root which explains to the IDE which CM file it should use. I don't know if you want something like that here, but something that achieves the same goal would be really useful.