First of all , Hi!!
I have a problem with subtool master for Mac osx
I have downloaded and installed, i was ready to test it and my surprise is that it hasn´t the MERGE option, is it normal?
I mean in PC´s version is available but in Mac…
It would be a Big Pity if that option isn´t available there 
), the Mac version of ZBrush has a Merge Visible option in the Tool>SubTool menu. As this is more efficient the option was removed from the plugin.