Option to block burst bucket usage

Sometimes I want to chat about things that are not urgent, so I don’t mind if I run out of the basic bucket and have to wait for it to refill, but other times, like when studying for an exam, I need to have the burst available, and I don’t want to spend the burst when I don’t need to, but I also don’t want to have to check my usage after each message. So it would be nice if we could lock it or something similar.