Job Schipper

I submitted my slam fightclass to the downloads section:

Its for vanilla only, but it should show you how to make your own for other versions.

@Chona see my previous reply.

I found a solution to this, without needing to to know if an auto attack "just happened".

Heres what to do (DIY with fightclass editor):

Add "Slam" to your fightclass, and for timer put down your weapon speed.

So for instance, for my WW axe with speed 3.6, put down timer: 3600

This way, it will work as intended most of the time.  When you start attacking, it will autoattack + instantly slam, and repeat.

I will upload a fight class that does this soon (vanilla), that also incorporates the adjusted speed for Flurry.