Question; how d'you swap weapons, when using a mouse? Smile I've got the hang of using the middle-button to accelerate fast, and the scroll-wheel to swap between gun and fists, but other weapons....?
First, you have to have other weapons.
A gun is about all you have in the beginning of the game.
You get other weapons by picking them up, as you play the game.
Always move over anyone you kill to get their maybe new weapon or the ammo they have.
Look in the game options>Customize Controls
Look in actions and weapons
You can change any of these settings.