I've been looking around at what people have to say about this and came across three tells that I am interested in hearing your views on:
1) If they take a long time to make a check they probably have a weak hand.
2) Long wait and then a raise, they probably have a strong hand.
For insta moves (When the opponent sets an automatic play to occur as soon as it is their turn)
3) Instacheck/call: Has a weak hand and therefore isn't really interested in the play.
4) Instabet: Has a strong hand and has made a decision before seeing what everyone else does.
5) Timebank runs out: A multitable player who is paying more attention to what is going on other tables and is playing ABC poker. If they bet, they have a strong hand, so fold. If the check, make a bet because they will likely fold. If they call a raise they are on a draw.
The first two seem a bit unreliable to me. There must be many players who deliberately wait a specific amount of time for each move just to throw people off. Not sure about the others.