hi. i couldnt find someone here wrote about one very important addon for rigid body constraints which is BULLET CONSTRAINTS TOOLS
it was super time saver for 2.79 and cant find alternative for 2.8
please maybe someone can update it for blender 2.8?
here the website: https://bwide.wordpress.com/scripts/bullet-constraints-tools/
but link not working anymore so found here: [WIP] Bullet Constraints Tools 0.3.7