For smaller deinonychosaurs (including microraptorines) and basal birds, the lack of prehensile ability in the manus implied by the long stiff fingers is weird... because other features (broad wings; phalangeal proportions; longer and more distal hallux) suggest that these critters were at least partly arboreal.
The wings of *Microraptor* are remarkably narrow, much more so than Archie's. Probably the foot feathers took over some of that function, though. *Confuciusornis*, however, has long, narrow wings and no foot feathers. The phalangeal proportions of both (and Archie) indicate that these animals weren't cursorial, but hardly scansorial either; Archie and *C.* are right at the boundary between terrestrial and scansorial birds, *M.* is not above it either.
The scansoriopterygids look scansorial or arboreal.