I'm impressed I haven't seen this one suggested yet, if it has been then feel free to disregard this. I've been thinking about, what if there was a visual on-screen booster timer for McMMo and sell boosters, could be in the form of an XP/health bar like McMMo or fishing contests that show up. I just think this is more useful than having /boosters, what with to check times, multiplier percentage, and even so other players can tell there's one active and don't miss any not knowing that they're active.
I also would like to see this be implemented. It would help so that new players don't have to take time out of the boosters to do /boosters and check the actual time, or maybe there could just be a command like... /boostertime for a chat message like: [PF Boosters] > 15 minutes left on 25% global sell booster. However it would be done, I look forward to the potentiality of this being implemented. EDIT: To add on, if the /boostertime command were a thing, a good way to make it work, since I already know there'd be people in chat asking how to turn it off, have the time toggleable in /settings.