“Is there a point between half cock and full cock if that if the hammer is let go it will return to the firing pin on assisted?”
On 1860s designed single action you bet your backsides there is a point. It is where the term going off half cocked originated. If the hammer is not locked back against one of two sears it will swing back forward under the spring pressure you just tensioned by pulling it back, this also will rotate the cylinder backwards to under the firing pin it is the unwinding of the hammer spring driving this action. Nearly every time the hammer comes home with enough energy to light off the round. You don’t even have to have your finger inside the trigger guard as the trigger is not involved in this form of a accidental discharge.
Not possible. The cylinder is not aligned properly until the hammer is pulls back ALL THE WAY, FULLY COCKED.