For what I can say (speaking about money games in Germany, as I never played live abroad) there are following aspects of etiquette, inter alia:
- Each player rolls his dice on the right hand side of the board. A roll is valid if both dice lie flat on the board. If a die lies on a checker, is tilted or has landed in the other half of the board, the roll must be repeated.
- A move is complete if the player to move has taken the dice off the board. Dice may be moved around on the board to make room for checkers. There is no "Berührt - Geführt" rule as in chess (I have no idea how this is called in English - it translated literally as "touched - moved"). That is, a player may move checkers around until he/she has finally picked up the dice.
- Once the player to move has picked up the dice, he/she is no longer allowed to alter the position. If he/she has made an invalid move, it is up to the opponent to either demand a correct move or accept the incorrect move (which could happen if the invalid move is actually to the opponents advantage).
- You are not necessarily required to say "double", "take" or "pass" when handling the cube. Putting the cube in the middle means offering a double, taking the cube to own's side of the board means "take" and shoving the cube back or setting up the starting position means "pass".