Create a github issue with all the details, screenshots, steps, process etc and keep an eye on it.
Under one bench site with same database it seems possible to consolidate.
Recently similar workaround for feature from odoo was discussed and concluded for now. Price list on the basis of "Cost" of item
Multi currency and Multi company already exists.
You won’t be able to move to odoo 9 as freely, you will have to find some way to migrate data from 8 to 9 later.
On ERPNext you get upgrades and patches are released on github.
Read :
https://blog.frappe.io/blog/development/voting-on-github-issues