With Sketchup 2018 probably just round the corner now, it’s probably a bit late to be adding anything (and these two may have a read been covered above),
Please, Please, PLEASE provide Sketchup with multi-processor/multi-core support. I have a Dell workstation with two Xeon processors, each with 10 cores running at 2.3 GHz (i.e. 20 cores in total). I bought this specifically to use with programs like Sketchup, and I almost couldn’t believe Sketchup only uses one core! Let’s just say Sketchup is “somewhat throttled” by its lack of multicore architecture, even on more “standard” systems than mine. By contrast, virtually everything else I use for 3D modelling (including VRay) makes extensive use of multiple cores, and the job gets done much, much quicker.
A more effective way of being able to provide wraparound backdrops using a 360° panorama. Again, I use other 3D tools (Chief Architect, for example) which have a much simpler and much more effective way of creating 360° backdrops than using a cylinder that goes all the way around the model!