Hotkey to add/remove +1/+1 counters

+1/+1 counters are so common. It would be nice to have a hotkey for them in playtest mode. It’s a lot of clicks to add/set counters across many creates.Some ideas below:

1. +/- (although currently used for life)
2. ↑/↓ (also currently used for life even though +/- icons are by life)
3. ←/→

Option 1 feels the most intuitive to me, but I acknowledge these keys and icons are already representing life. Would then vote for option 2. But feel free to explore others.