Hello Kaos,
If you really meant the AD8436:
It depends mainly on the application, power cpnfiguration and type of package. If you're usingt the CSP packgae you might find it convenient to not connecte them, as close tolerances may become an issue. If the environment is extrememly noisy you might consider connecting pin 3 to 4 and 13 to 14, You would never connect an amplifier output to ground, as you noted in your list.
I.m not the apps eng for hte AD9834.
Best,
Apps. guy