I guess it's not much different than the Ask, Tell. Remove approach to disciplining the benches.
But, instead of only reporting when they're binned, you'd also report them for the official yellow card.
If it were to be implemented here at Grassroots there would need to be alot of work down by clubs to makesure their coaches etc are all registered on WGS, and that any league that uses teamsheets provides enough space for all of the coaches etc to be entered.
But, then surely we'd see a problem with controlling those who are supposed to be in the technical area. Most of my games takes place at a local park or playing field where each teams "technical area" is a mix of players, coaches, and people who might be coaches or might just be people watching.