This looks very interesting, and something I could really use myself. Besides using it, it also looks like a very challenging and fun project to implement.
Someday I'll sure want to try my hands on writing something like that.
Thanks for sharing the info.
About priority I know is not like you but you can do a left click into object which are stacked. And select the one you want.
For other thing you can do it in python ;)
About tag I don't really udnerstand what you mean but I have no doubt you can do it in python ^^
Even if you can't do it directly in python you can display it in the viewport or anywhere you want throught python.
About preset you mean for UD creation? Again it can be made in python :)
New projet can be easily done in python excepted for texture path which are global :/
About Nitropose I currently developped one
And I will release it as open source when finnished !
About material creation I 100% agree but again you can make a simple button which gonna create your material. And since you speak about redshift I point you to the script I made for rs script creation => https://www.redshift3d.com/forums/viewthread/10457/P30/#69130
For the background color you can change it into preference color. And you can also easily make a python plugin for switch beetwen them.
Anyway I don't have a lot of free time due to my school animation project + work but when finnished (in 2months), and acording the update from R19 I will make thoses plugins ;)