Seems i have can not make my self more clear.
I am not looking for system vars. or code to program scale.
I just want an ordanairy AUTOCAD COMMAND to set my scale... 
Let's see if I understand.
1. You want a way to set your annotation scale factor with simple menu call.
2. In addition, you would like that menu call to let you select the scale factor from a simple list.
Item one, can be performed with the snippet I posted using the cannoscale system variable as if it were an autocad command.
Item two, is a bit tougher. There is no native autocad command that will do this, however, it can be done without too much work, if you have, or are willing to use doslib.
http://www.en.na.mcneel.com/doslib.htm We would be glad to help you learn how to do this.
If I've missed what you are wanting entirely, then I'm sorry for being dense - help me understand what you want.
