Looks like the single pro tem mod hasn't been active for over a year, and it seems to me that DonQuiKong, Eric Shain and Maca are doing the actual mod work on this forum.
Possibly it's time to formalize and appoint new pro tem mods?
This site does not function like any other Stack Exchange site. It was created without the process we typically use to make sure it has a sufficient community to support it. When that didn't work out, I was asked to unilaterally maintain this site absent any significant community self- moderation. Everyone we have enlisted to operate this site is long gone, so I will not likely be appointing additional Moderators here anytime soon. I go into this more here:
I can understand the frustration when folks expect this to work like any other Stack Exchange site. It's a contentious issue every time it comes up. Even if the users you listed agreed to step up, the future of this site is uncertain. Realistically I don't want to start enlisting folks for Moderator positions when the fundamental problems with this site remain unaddressed, and there is no watchful community to balance out and support those roles.
What I'm doing doesn't need mod power and I do agree with Robert that this site needs some kind of rework. He does most of the necessary mod work and I mostly agree with his actions.
I don't see many unsolved jobs for a mod here, so I don't think another one is needed. I don't know how much the other pro tem mod does as hidden work, but I've seen it occasionally, especially when looking for his actions, so I suspect it's more than you think.
I've realised that the occasional spam question which doesn't get fast flags or mod attention can be solved by bringing it up in the main meta chat.
This site allows us to participate and has the necessary moderation. Other than taking some work away from Robert, I don't see a reason for a new mod unless the site grows a good bit.