I've been playing Steel Beasts since the first demo over 11 years ago. I like to think I might have received the very first commercial copy sent out in 2000 as I lived and worked very close by eSim Games.
I've used the mouse plenty of time during that time- including when I didn't have a joystick or needed a replacement when the current one was being tweaky, insensitive or going out of tolerance through use. I have personally found the mouse to be a more difficult control scheme for scanning and slewing- the combination of using the mouse for menu interface and issuing orders from the mousescreen plus a decent joystick for simulation controls work for me.
In a way, the mouse confers some advantages that seem rather artificial to me. Operation of crew served weapons like a heavy machine gun with a mouse is just further from the mark than a joystick, even with the joystick being a crude approximation, the mouse is that much more 'strange' in my view. It lacks mechanincal feedback or resistance that at least a joystick has. A mouse feels like it distorts moementum or inertia, things just seem to float in a way. I feel like a Jedi who can move things by waving my hand.
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No one gets out of here alive.