Yeah, basically just tell my team I'm putting my shield down for a minute so they can properly take cover before I put it down. I also regen my shield as much as possible, there's no reason to keep it up when it's 1400/2000 and their team is dead (unless they have a sniper), put that shit away and get it to full while you can.
I made a thread on the forums suggesting them to add some sort of command to let your team know you're going to put your shield down, but it was mostly ignored by people saying "just use your mic" lol.