I usually let my time bank warning countdown come on regardless of my action so no tells are leaked. It doesn't matter at the level I play but is good practice to get into. Most peole are multi-tabling so the timing tells are not something I would rely on.
The problem with this is,,,your annoying the whole table and they will `gun` for you,,,and you don`t want that unless you have the nuts.i`m the opposite and play without a hesitation in my bets,,,i find it puts people on their heels and forces them to make decisions before they ready,or their ego gets the better of them.
(and your right about the Hud/multi table guys,,you know their playing by hud and by how you`ve played so far,so i take that in account)