Yeah, it'd be nice to import objs and textures, but Construct isn't even 1.0 yet. No commercial game using Construct has even been successfully released yet. I'd rather see the developers focusing on making this the best 2d engine available instead of putting too much time into adding 3d features.
3d is complex, 3d is always adding a huge overhead in terms of complexity - Not sure it'd be smart to get into all that just yet. And as Aeal pointed out, there are a handful of very capable engines now that completely focus on 3d (Unity) and some even have event based systems (UE: Kismet, CryEngine: Flowgraph), so if you wanna go 3d, those are probably your best bet.