VAMTweaks is a plugin dedicated to tweak VaM settings. At the moment, there are only shadow settings, but I prefered to use a broader name for the plugin if some new ideas pops up and might be interesting to add in this plugin.
At the moment, you'd only use it to tweak shadows, mostly shadow distance. But you can also influence two additional settings to improve (depending on your situation) the quality of directional light shadows.
The plugin as to be loaded either as a session plugin, or on an empty atom.
Do not forget that tweaking shadows can have an impact on performances. I would recommend to dedicate a plugin like this more in virtual photography situation. But it does not prevent you to use it in a realtime / VR experience tho.
Example
Left, native VaM shadow settings. You can see a tiny bit the shadow, but if the room was deeper, you'd have zero visible shadow.
Right, shadows modified with VAMTweaks on spotlights.
Click on the pictures to zoom.