No, I'd only want the IR to stay on when the signal is coming out of the DI XLR output regardless if the DI switch is on pre or post.I mean I am not sure it is possible to simply not load and IR into the box, so if you want a flat response IR you would have to create it.
Of course I can use the "post" and just set the EQ flat but if I want to use the EQ for my amp through the plug output (naturally with the IR off) then the settings effect the DI signal too.