So...it seems as if we have really wandered from the OP's question.
What we know:
Stage Convention
SASS default: If no starting position is given, the shooter shall stand upright with revolvers holstered, hands at the sides and not touching any firearm.
We know that overriding one part of this convention does not override the others. For instance, if shooter is to start with hands on hat or other stance, they must remain standing upright until after the beep, unless stage instructions indicate otherwise.
o Example: Just because the scenario states to point 1 hand downrange does not mean the shooter can have the other hand on the gun or bend down over the gun, unless stage instructions state otherwise. The other hand must be at SASS default, at side not touching guns and shooter must be standing upright.
Ammunition convention
Shooters may not start a stage with ammunition in hand(s).
We also know that these non-safety conventions can be overridden by stage instructions.
So...just thinking out loud here, if the stage writer wants to have a starting position outside of the SASS default (which I am a firm believer that NO stage should start at SASS default because it's boring), then it is critical that the limits that you wish to place on the shooter are clearly stated.
For instance:
Shooter starts anywhere at their discretion, hands not touching guns or ammo.
This way, the shooter not only knows their expected position for starting, but also what they are explicitly not allowed to do, especially in the instance where a match or stage writer is making up their own stage conventions such as 'ready position' or 'agayw'.
Just a thought.