I keep trying to design humanoid and humanesque sapient aliens, but I often run into issues with the feet; In an orthostatic biped, an enlarged first toe (big toe) is probably essential to maintain proper balance, but if this is on a plantigrade foot it will look much too human-like, and digitigrade bipeds, while both plausible and sufficiently inhuman even with a big toe, require special effort to explain why they have human-like hands, which is another thing I would like.
Recently, however, I came up with a new spin on an foot design I've seen in art from time to time, which is essentially a hybrid of a human foot, a chimp foot, and a carnivoran hindpaw. Like a chimp's foot, its first digit is a thumb, but the last four digits are moreso similar to a human's first four toes, and the entire thing is made partially carnivoran-like by the presence of claws and thick pads.
A: heel/talon pad, B: Ball-of-foot pad, C: Heel-of-thumb pad, D: Thumbtip pad, E: Big toe pad, F: 3rd and 4th toe pads, G: 5th/little toe pad, H: Claws
At this point a I feel I should reiterate that this diagram is of the foot print not the foot itself; The foot is not as narrow as shape C, there is simply no padding under much of the arch of the foot.
My idea for this foot design is that it would be a compromise between optimisation for chimp-like arboreal climbing and optimisation for human-like ground-level long-distance running, having a thumb that could be used for climbing without having such long main toes that running would be dangerous and tiring.
My question, then, is this: Is my supposition that this foot would work as a compromise between arboreality and cursoriality valid, or would it only combine the worst of both worlds, creating a foot which is neither good for climbing nor running, more specifically in the context of a vaguely humanoid orthostatic biped?