Ever since the previous tf2 updates medic can taunt with right click. So if using the amputator, while !friendly you can use right click to taunt and heal allies.
Also, if using the ubersaw, it will do the short stun on the player and give you %50 uber, which can be used by disabling !friendly.
Fortified Compound taunt working while !friendly, causes others to become stunned.
I'm sorry if I become rather annoying with the constant bug reports. It's just from previous experiences I've noticed them and decided to see if they would of been exploitable again.
Heavy is able to throw Dalokos Bars while !friendly.
Reskins of Jarate (Self aware Beauty Mark) and Mad Milk (Mutated Milk) are working while !friendly, can be thrown and grants their features. It gives the !friendly player the assist as well.
!friendly players can destroy !rtd based buildings.