Wait what the.. so ANYONE can load ANY save in ANY server?
If so that's loving abusive and you need to fix it.
If not.. that's loving awesome and you win.
Edit: reading through I'm leaning towards the first option...
That is awful, there is a reason Loading saves is admin only, you stupid kid. "macros can be spammy" is BS, macros take forever for a regular player to execute if they're that big. You can easily ban someone before they finish their spam macro and clear their bricks. however, being able to instantly load masses of emitters, projectiles, bricks and whatever else lags up the server is just horrible. You can not instantly ban someone and clear their bricks while they load up a build that's in the process of lagging you up. Have you ever loaded a build you know is laggy? Yeah, it lags awful while it loads too. How are you supposed to anticipate someone loading something?
As an active host, the last thing I want is a bunch of forgetass trolls coming into my server and crashing it with this awful mod you've thrown into the world.
You just handed out the ultimate trolling mod to a community of trolls. Congratulations, Nexus, on the great accomplishment.