If you haven't tried H16 yet, you may find yourself banging your head on the desk because they have changed the hotkey "1" and "2" to set the display/render flags.
They have changed the key and also the way it works.
1. New way, hold "R" and left click on a node to change the display, "T" to change the render flag.
2. In between way, there's a preference called "flag hotkeys work on existing nodes" in network editor preferences. Now, if you press R/T, it'll set the display/render flag without the need of a click.
3. You can update the hotkeys, they're now called set primary/secondary/third flag in Houdini/panes/network editor - primary = template - secondary = render flag - third = display
If you wish to update these shortcut, you'll have to restart Houdini