Thanks for the suggestions! I know the visible/invisible option has been a popular request.
BTW, I wouldn't consider myself a GUI/HMI expert, but your mention of colors compels me to say: "Don't forget the many colorblind among us!" (who can't tell red from green, for example).
Also, I know many of the perceived "limitations" in groov are by design since the developers went to a lot of trouble to provide tools which encourage following the Best Practices of High-Performance HMIs. If you've not see [this page (especially the white paper near the bottom on [URL="http://groov.com/wordpress/wp-content/uploads/2013/03/2061_High_Performance_HMI_white_paper1.pdf"]Building an HMI That Works: New Best Practices of Operator Interface Design](http://groov.com/high-performance-hmi/)), I'd strongly encourage you have a look.
As far as what you CAN do in groov, I know some customers have written a little more logic on the strategy side to change the text in one variable (rather than hiding/showing stacked variables). Here I've got a little bit of color and some text that can provide clues for those who can't differentiate those colors:
If you can share, we'd love to see some sample pre-groov and/or post-groov screens!