I love using the canvas tube to build round buildings, but if they’re larger the walls become super thick.
This has been brought up in other suggestions before, but I haven’t seen anyone ask for this fix specifically. Having a default radius that matches the current one wouldn’t break anyones existing builds, but having it be a value that is changeable would allow us to have larger tubes without using the scale tool (which makes the tube thicker).
Assuming I’m understanding what you describe correctly, maybe we could just have a slider to control the thickness of the walls separately from scale of the item as well or instead of what you suggest? Unless I’m just accidentally suggesting more or less the same thing as you already are. Regardless though, I think the more options people could have for things in general, the better 
Catch my vote for this!
If you did this, you’d essentially have two options for scale (one in the items options and the normal scaling option).
Having a radius option would let you increase the radius (space in the middle of the tube) without changing its scale at all.
Yeah, this has been a super annoying feature(?) of the tubes that have made me not really use them. I really hope it can be changed or a new setting for the tube can be added to have it not do that.
Fair. Would letting one adjust the radius also work for controlling how thick the walls get though? Because I think that could be useful for many players to have separately still.
You can just use scale to do that. You can balance the two to get the exact size and thickness you want. That’s the point.
Alrighty then. That sounds like a good option.
something like this is being added in the next update.