I spoke with developers and they informed me that 4.5 Preview has a new option in Editor Preferences > Experimental for Use New Blueprint Menuing System. If you enable that, it should fix most of context sensitive problems. They have since found and fixed other issues that will still be present in 4.5, but this should ease some of workflow disruption in meantime.
It is also fixed in our internal build, so you could build from source with latest commit and use that. Hope that helps!