moobot83: they seem to be able to change features in other games and SWOS was never played with a keyboard cos it was on consoles
SWOS was originally released only for Commodore Amiga and MS-DOS, so no, it was not "on consoles". It may have been re-re-re-released much much later on XBOX360 (according to mobygames.com), but that is irrelevant.
Back when this game was released on PC, and in MS-DOS in general, PC didn't really have "gamepads". Gravis tried to release some kind of Super Nintendo kind of digital gamepad but it didn't really become that widespread, only mildly successful.
So yes, the PC version was meant to be played with a keyboard, and possibly an analog joystick. And yes it was quite normal for MS-DOS games that you had to manually calibrate your analog joystick, if you wanted to use it with a game.
There is not much GOG could do to change that. Since it is apparently a DOSBox game, one option might be that in the DOSBox settings, you tell it to reroute the keyboard mappings to your gamepad pad and buttons (not the analog thumbstick). I recall doing that with e.g. the GOG version of Tomb Raider, in order to play it with my Logitech gamepad.
I think I did it through the DOSBox keymapper. Read this, especially the part "Examples about remapping the joystick":
https://www.dosbox.com/wiki/Mapper