I don't know if such an idea is feasible, but thought I should throw it out there anyway in case it caught the eyes of a capable programmer.
Basically pool navigation has always been inconvenient since Danbooru 1 and got a bit worse with v2.0.0 (I do like the placement of pool title in v2 better though, no more huge ugly gray boxes stacked above images). To go to the next post, you have to go up from the end of the picture or comment section to the top, find the 'Next' link and click it.
My idea is to implement a [Pool Mode] button on each image (together with other options like Resize, Favorite, Add Note,...). Upon entering this mode, going to prev/next post can be done by hitting arrow keyboard. No more mouse clicking needed. This mode lasts until the user clicks on [Pool Mode] button again. If an image belongs to 2 or more pools, clicking [Pool Mode] will promt a list of pools (that image belongs to) for the user to choose.
Another way to arrange this is implementing a button for every pool title that appeared on an image. Users simply click on the button corresponding with the pool they wish to enter.
Updated by Sal.N
