Isn't there usually an audio cue for a scuttling action? There's also a "Scuttle Time Remaining" countdown timer displayed above the image of the object on the centre bottom.
There's a countdown and a status bar for the planet or item being scuttled but you have to know it's being scuttled in order to go look for it. What I want is something like a dummy checkbox that pops up asking, "Do you really want to scuttle this planet (Y/N)?
My team won that game, btw. It was wild at the start with my home terran being directly connected to the other guy's home terran. With the help of a great teammate we knocked him out but after he had quit the game I noticed my home terran was gone!