It will only store "one" value and yes, overwrites so last one in wins. Most people use a delimited string to pass multiple values and then parse out the appropriate piece for each parameter.
Would that work for you?
-craig
"You can never have too many knives" -- Logan Nine Fingers
Well... there very well may be but you'd need to better explain your needs and what precisely this 'control job' did for you. There are always other approaches, up to you to decide what's "easiest" or "best".
-craig
"You can never have too many knives" -- Logan Nine Fingers