StratoBash has been updated to Unity 5.6.5p4.
Also, a new launch parameter (also known as argument) has been added:
--sensitivity=
The default is:
--sensitivty=1.0
This would double the mouse sensitivity:
--sensitivity=2.0
Here are the instructions for setting launch options:
https://support.steampowered.com/kb_article.php?ref=1040-JWMT-2947