Oh a list of things that could be useful for script calls and conditional branches. Neat (:
I use a few that maybe someone might find useful as well.
$game_message.busy == true/false
I use this not to run certain parallel processes when there's text showing.
$game_map.screen.weather_type == 1
And this one to check what's the weather like. Compatible with Darkleo/Ccoa weather script.