Is there a mode that lets me set P and A?

nosnoop wrote:

It's only you.

I can't see evidence of the OP lacking in photography skills or understanding the exposure parameters.

The OP is simply asking for the TAv mode as implemented by Pentax or the Auto ISO in Manual mode as implemented by Nikon and other manufacturers.

This is a very legitimate request. We have 3 parameters to control. Now we have Auto all 3 (P), Manual all 3 (M), Fixed one and Auto-2 or fixed two and Auto-1 (A and S). So why can't we have chosen Aperture and Shutter Speed and Auto-ISO? Pentax is the only manufacturer who understand this need, and have properly implemented a dedicated mode for this. Their Auto-ISO is also the way that all others should follow.