Div ,
I understand what you are saying from an advertising point of view, i`m sure many of the people who are your target audience would be in the two stands you mentioned (although i take it you only want customers who support St.Mirren then !? obviously coz the away fans cant see it & it is virtually unreadable to the TV cameras)
As for birthday messages ,I would hazard a guess that the majority of the Birthday requests are aimed at the Kids in the Family stand and i`m sorry , a very large amount of the text on screen simply cant be read from the south stand so we are gonna have a lot of unhappy panda club members and disgruntled parents !
Sorry Div , its not fit for purpose, would you be happy if the tannoy could only be heard in part of the ground that you were sitting in ?