Dysfunctional Rules IV- It's like a sandwich made of RAW failure!

[nedz]

Sort of got lost in the mishmash last thread, but:

You can fight with two weapons with no penalties without the TWF feat. You only take the penalties for TWFing when you gain extra attacks from wielding two weapons. BUT you still take penalties for wielding a weapon in your off-hand, despite handedness not being a thing.

Relevant ancient thread.

How/When do you designate which hand is your off hand ?

Can you re-designate this just prior to each attack ?