Apparently Steam version had control customization added in a patch over a month ago.
Version 1.0.8388 Released
13. toukokuu - ehahnda
We have a new patch available! This one includes customizable controls, and a whole lot more. Check out the change list below:
*Added customizable controls
* Removed the portraits in Englestrome that sometimes appeared on top of other portraits
* Made the collisions for the artillery and machine gun turrets consistent for each direction
* Fixed generation issue that was causing auto turret collisions to be partially overwritten
* Displaying ship buoyancy in the examine window now
* Fix a bug that would bring you back to life if you die in the Temple of Cordeus interior and try to go back to town
* Added life meter to inventory and simlar pages
* Added text amounts for your heath on your health bar
* Fixed bug in the driftstone fortress that could sometimes duplicate your active ship
* Inventory items that are in your quick slots will be marked in your inventory list
* Fixed the underpowered starting ship in the first area
* The ship in the starting area uses the proper indicator icon now
* The screen edges will go cloudy now when you are choking on gas
* Improved positioning of squid corpses when they die
* Fixed a rare divide by zero error when generating temples
* Improved tool tip positioning
* Added quantity increase holding and acceleration to buying, selling, stashing, and dropping
* Clearing areas in the world when loading ships at the dock to ensure that really large ships don't get stuck in islands
* Distinguishing between the case where you successfully defend Englestrome or just run away.
This is the last latest patch posted on Steam (also no on GOG):
Windforge Version 1.1.8435 Released!
17. touko
Hey everyone, we have a new update available. Besides a few fixes, and gameplay tweaks, we also added a new recipe, a giant version of the kraken, and around 10 new ships to spawn. Enjoy!
* Fixed up the naming and items in some of the stores
* Reduced the weight of background blocks
* Increase repair speed for background blocks
* Increased background block crafting quantity
* Added destroy effects to a bunch of objects
* Fixed a bug where building on anchored ships doesn't update the collisions properly
* Added support for neutral ships that will only attack if they are attacked first
* Improved crew AI idle when they don't have a target
* Fixed a problem with ship danger level calculations
* Fixed bug where tight walls to the side of propellers could cause obstruction
* Improved scrolling cloud popping problem
* Fixed issues with meteor spawning not working at area boundaries
* Fixed an issue where some of the temple guardians would wander around before they saw you