Same issue, still no solution for that. Define a focus area, blur everything else. It was really simple with the gaussian DoF, now it’s not possible at all, to e.g. fake a tilt-shift effect.
Update: Gaussian blur can be implemented like that as a custom node:
https://www.raywenderlich.com/57-unr…toc-anchor-006
… But I haven’t tried that yet, I guess that it won’t work in current engine version…?
… Maybe this combined with some depth distance masking could serve as a workaround for the lack of gaussian DoF.