The Plex desktop apps (but not the web app) have the most flexible options for this kind of thing.
Plex Desktop
  
  
    Figured it out. For anyone having the same issue as me, check this example script out. Keybinds only work through the mp.add_forced_key_binding() function, non-forced does nothing. 
The keybinds are Shift++, Shift+- and Shift+0 to add, subtract and reset the zoom level respectively. 
Don’t forget to change the extension to .lua, and then you can just put it in %LOCALAPPDATA%\Plex\scripts\ for it to work. 
zoom-keybinds.txt  (798 Bytes) 
[admin edit: file attachments are automatically purged after…
   
 
Plex HTPC
  
  
    I have a PC hooked to a 21:9 screen. 
Plex HTPC seems to run fine although the menu is in 19:9 aspect ratio. 
With the normal plex desktop player or plex media player (without tweeaking), when playing a wide screen ( 2.39:1) film encoded in a 16:9 aspect ratio video file with horizontal black bars to fill (blu-ray often are), the video does not take the full screen and you have black bars on the left and right of the video, plus the one encoded in the file so you can’t enjoy the full size of you…
   
 
             
            
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