hi - I'm the vlc remote developer. I think I can add a little info here.
this isn't actually an issue with vlc remote, but rather with the http interface.
if you open a file with the standard interface, then vlc opens any srt file with the same name from the same folder
e.g. open /movies/somemovie.avi
and vlc will add
/moview/somemovie.srt
if you open /moview/somemovie.avi through the http interface, then you don't get the same behaviour (no subtitle file is loaded)
I have added a ticket to trac
https://trac.videolan.org/vlc/ticket/4008