Not deliberately. However, I quite often score better on the longer holes than the shorter ones. I get on the tee of a long par 4, for instance, and mentally tell myself that 5 is a good score and pretty much play the hole as a de facto par 5. Its surprising how often that leads to a 4. On the other hand, I stand on the tee of a short hole and mentally tell myself I should be parring this hole and then proceed to mess it up!
I'm clearly in a minority here but I do try to follow the above theory and that also follows regarding SI. If I'm on a SI 1 hole then I add a shot to the par and try to play to that. It takes some of the pressure of what is likely to be a tough hole. It stops me fighting the hole. If I play it well it is a bonus, if I mess up I don't beat myself up about it because it is a tough SI. Most people I play with also are aware of the SI so I am surprised at most of the posts.