I've seen mention of shield bash in the feat list. I don't have the feat, but it looks as though I should be able to do that particular move. I can't find it on the radial menu. What's the trick, please?
Create 1 human 1st level fighter - your 3 initial feats are Two Weapon Fighting (your longsword and shield being 2 weapons), Improved Shield Bash and Shield Specialisation. Equip the fighter with a large shield and longsword (for example) THEN click on Options>Enable Two Weapon Fighting
You can also just shield bash by setting your shield hand to the primary weapon in the same spot in the radial menu. Then it won't matter if you have the two weapon fighting feat. Also, you can't shield bash with bucklers or tower shields. So if you're not seeing the options at all, that might be the reason.