Like i said before, a good middleground would be a Viewer-tool. It's not the final uploads that are so annoying to wait for, it's the test iterations, so to speak.
But any offline tool surely won't happen, this isn't Unreal Engine or another generic engine, it's Frontier's In-House Render Engine.
They'd be careful to expose it again. Which might also be a reason it took so long for it to happen in the first place, the TMTK.
More servers, i second that.
I'd like to see more than 25 Slots as well. As much as i delete old item slots, i'm always at the limit.