Creates a continue forward key that will keep you moving forward without having to hold down a key.
Hopefully this feature will be added to Subnautica in the future. Until then this will do nicely.
Also can work with any game that uses the [ Up Arrow ] for forward or allows you to map the keys.

Move forward needs to be set in Subnautica to the [ Up  Arrow ] key. 
CFkey will then toggle continue forward on/off with the [ 0 ] key, or off with [ Up Arrow ].

Program is freeware use at your own risk. 
Please leave any comments/suggestions you may have.