Add delete button to delete all trees created with the add-on

Hey there, great addon, just wondering how to get it to work with blender 2.8. I installed it both ways: extracting the zip and copying to /roaming/../addons and also by installing through blender preferences gui / install addons. But I can't get it to work. Is there anything missing to make it work with most current version of blender? Thanks

scale and path_scale for add_quad_diameter should be adjustable in the UI

I'm currently using your addon to create semi-realistic arterial/vein structures but since originally it was meant for creating dendritic structures I'm running into issues.

Mainly, I'd like it if there was the option to have multiple root locations so I could start an artery at one point, have all the capillary branches, then have them group back to a single or multiple veins.

Currently the only way I can do this is more of a "trick" where I make 2 different trees that are slightly different, flip one 180 degrees, then merge their geometries. But, this is inefficient and tedious and usually results in a bunch of meshing errors when I try to port them into COMSOL.

If there is actually way to already do this I'd love to know.