I have already looked at someone trying the opposite: can I get ConEmu to "mark to copy"?, but I had already tried unchecking "Copy on Left Button release".
I'm running ConEmu 140216b, installed(as opposed to portable), on win7. Off chance it matters, running kitty(a putty fork, with updates) as the console.
It is an alpha build, and as there are no stable builds on the download page, should I just try installing the preview build?