If commands were given to only a few selected mods, in this case the more experienced ones, that would be creating a separate mod rank, and Cyp has already said that they will not be adding extra mod ranks.
Even with gamemode 3, mods could still be seen in tab. Vanish could also be abused but if hitting was off when /v is turned on, I don't see an issue.
They can always make it like this: Doing /fly puts you into: /god /v Doing /v puts you into: /god /fly Doing /god puts you into: /v /fly Not too sure how well it'd work, but it might
Actually, I think the /v command would be a great addition. When I was staff on other servers, it was extremely helpful to catch hackers with. I don't think spectator mode would be as helpful either. If a mod is going to abuse the /v command, they probably shouldn't be a mod. There's something related I'd like to suggest, staff ranks below mod. This would also allow the more trustworthy mods to have more privileges.
Of course! I could go into plenty of detail with suggestions on the below mod ranks, having helped server owners create them before. Overall, I think the mods should be given more perms in general. On most large servers, there are often two ranks below mod. The lowest is like a trainee "Helper" kind of thing. They usually are only given access to simple commands like /fly, /kick, /socialspy and /mute. This rank is good for seeing if the person would actually be a good mod. The second is something like a "Jr. Mod", the rank a helper type staff member would get after being promoted. They would have access to commands like /ban, /v, and whatever other commands that the owners think should be given to someone they trust more than a helper. I'm not sure how it is for staff on this server, but on most other servers I've worked on, the Mod rank usually has access to /gamemode. They are also able to change minor technical things on the server, and they can build inside of spawn areas. I think this would be a useful addition because it would allow the mods to better help the owners and admins, as well as make it easier to hire staff. If you think I should elaborate on anything, just let me know. sorry for so much text whoops