I don't quite get his use case either, but a "do nothing" option would be cool none-the-less. It also gave me a new idea/suggestion. Maybe this is already possible with the existing triggers, if so, I'd love a short explanation The idea would be to have an optional AND-logic channel (default is 0: No Channel. I don't see a use-case for an OR-logic here, but maybe someone comes up with one) and a part that goes with it. Heck, you could even just add a version of each trigger that doesn't fire any action, just broadcasts it's trigger status on a channel. Anyways, let's say you have 3 symmetric engines with seperate fuel supply. You want staging to occur when all 3 are empty, not when the first one is empty. If they for some reason don't empty at the same time, even if the difference is in the microseconds, bad things happen. So you place a fuel trigger on all 3, set them to do nothing, yet assign them to channel 1. You place a single channel receiver, set it's action to stage and it's channel to 1. When all triggers broadcasting on channel 1 (I guess you'd iterate the vessel parts at launch and put them in a vector. If a part gets detached from the spacecraft it is ignored.) have switched to true (condition met at some point) it executes the action, in this case it detaches the stage with the 3 symmetric engines once all 3 are empty. You'd even get some nice combo effects. Say you have a trigger that fires pretty much at start and a trigger that doesn't really fire at all (say under 4km while disabled during launch and the use case is relevant much before re-entry). You'll get a true and a false on that channel so a channel receiver wouldn't fire.... Until the trigger that evaluates as false gets detached from the ship thanks to staging. The use case for this is, of course, activating an action group with parts that aren't on the staging queue, or else there wouldn't be any point As for the altitude trigger and your response: I see, that's unfortunate. Could we maybe get more options than just Meters and Kilometres? This plugin is perfect for re-entry scheduling, yet the altitude trigger has no values in the range between 100m and 4km.