Has anybody tried using this?

[bobboese]

Cool but how could you actually use it on the court?
Seems to me the R1 doesn't want to be entering every change. The R2 can use it in lieu of a line up card and to eliminate roster issues, but the R2 can just refer to the visual score for that aspect.
Do we need to know match history?

So...it's good to track player position - i.e. a lineup card.

Seems to me the screen set up could be a lot simpler it if were a line-up card replacement.