Please consider adding the ability to "pin" certain labels to the top of the labels list (ie. above "smart labels"). This way certain labels are always immediately accessible without a lot of scrolling.
Thanks for your suggestion! Boxer has an algorithm for “smart labels” that will allow the most used labels to stay at the top. You also have the ability to search for a folder or label (search bar is at the top of the label-picker), that would allow you to avoid having to scroll through all of the labels. Because of these two workarounds, we likely won’t be implementing the ability to pin a label at any point soon. Thank you for your active interest, and please keep the feedback coming!