Hello,
it would be nice if I could control the exact radius of a ZSphere just using the brush radius and clicking on it to assign the new radius, like you do for the IMM curve brush. Also coping and pasting radius between ZSpheres.
The best would be if I could click on ZSphere and a new ZSphere will be created with the same radius of the previous created ZSphere, ie, if I create the ZSphere for the phalanx of the index, I can click other three times over the ZSphere of the hand and I will be sure all ZSpheres of the phalanges will have the same radius (I know they have different radius, but the example was to show you my request).
Last thing: Mirror is working, but it would be nice to have a Resym/Mirror and Weld tool.
Thank you.
The best would be if I could click on ZSphere and a new ZSphere will be created with the same radius of the previous created ZSphere
You can already do that. Start to draw the ZSphere then press Shift before you let go of mouse button or lift pen. It will snap it to the same size as previous one.
Hi Zber2,
I already knew what you said, but it’s not my proposal.
Maybe my example wasn’t clear, I’m not talking of creating a ZSphere on top of the previous one, as it works right now in ZB!
I’m talking of creating a ZSphere in other areas with the same radius of a previous ZSphere, something in this image, where I would like to have ZSpheres 2 and 3 with the same radius of ZSphere 1:
I hope it’s more clear now.
OK, I see what you mean now. Yes, that would be a nice feature.
The online docs say it will snap to the Draw size by holding down Ctrl, but that doesn’t work anymore for some reason. Unless it’s not what I think
Interesting!
Yeap, you’re right, I don’t know, but it’s not working.
Anyway I discovered that if you draw a ZSphere, while pen/left click is down, than you press and release CTRL, the ZSphere is drawn white, then if you move a bit, a new ZSphere will be drawn, then if you press and release CTRL, you can draw a chain of ZSpheres! 
Remember: pen/left click has to be down all the time!!!
I didn’t know that.
It would be fairly straightforward to script a way of doing this, although I don’t know quite how closely the zsphere radius would correspond to the Draw Size or how the Dynamic option would affect the result. The simplest way to implement this would be to press a hotkey while holding the cursor over the zsphere. The plugin would then resize it.
It’s also possible to adjust zsphere symmetry. I did write a plugin some years ago but if I remember correctly there were some limitations. It would be very difficult to do a version of “Mirror and Weld” for zspheres, partly because you can’t have separated chains.
Anyway, I’ll take a look and get back to you in a few days.
Thanks Marcus! 
Marcus, thank you very much.