A bug has been reported for Live Cams 3.6 which prevents some cameras from showing the "Control" button for PTZ capabilities. This bug has been identified and corrected and a patch will be released to Apple shortly.
For private cameras there is a workaround in which you can click the "Options" button, then "Edit Connection Settings" and then choose cancel to return to the video screen. The control button should then be visible.
We're surprised that more people haven't reported this issue but we hope to have the patch out ASAP nonetheless!
UPDATE: May 7
Version 3.7 has been submitted to Apple for review. It corrects the issue with the missing button.