Find file /usr/local/cwpsrv/htdocs/resources/admin/include/3rdparty.php
If there is no file named 3rdparty.php then create it.
Open it and paste this code in it.
<li><a href="./index.php?module=ts3_manager"><span class="icon16 icomoon-icon-arrow-right-3"></span>TS3 Manager</a></li>
After that you'll se new button in menu > Developer Menu
!!! But be aware that CWP devs can at any time delete that ts3_manager file, and you won't be able to use it anymore.
For my custom ts3 manager, I'll do my best, since I have no time that much to work on it, it will take some time, maybe a week maybe a month or even more.
And about your question about auto updater, I don't think that's a good idea. First because of terms of service/usage by Teamspeak it self, and second, autoupdate, something can go wrong at any time and you can lost your ts3 settings including groups and permissions, etc.