The right move would be to assign a partner to a role and then leaving him/her the choice to ask a volunteer or to call a contractor for some projects. He then process tensions directly with the volunteer/contractor.
the issue at hand is: there is only one staff “partner” for the entire organisation. The rest are volunteers only (roughly 20 to 30 really contributing, I'd guess – and I am among them, a volunteer). And yes, not burdening them with too many bureaucratic efforts or meetings is entirely in our focus. Yet, at the same time, making sure decisions are made soundly and processes are running smoothly is just as well an interest of ours …