Playblack range on timeline (Proposal)

I decided to propose this change on the timeline about the playback range key (P) and how to make it more responsive.

IMHO, I think if the playplack range selection actually has a range slider to increase or decrease the region of selection, it would help users work more faster, instead of pressing P all the time when trying to re-select another region on the timeline. I don't know if its actually part of the plans the developers have on ground, but i believe it'll help. thanks