If you followed the instructions in the first post for modders then you will already be using svn+ssh as am I. So that part we are doing correctly.
The rest just says that their software does not provide a solution to the need for entering the password many times. In fact it causes the problem. The fix is to install yet another bit of software. That software remembers your password for you for the time of the connection to the SVN. At least I hope it is only for the period of the session. that is as far as I got.
It doesn't work for me (no idea why), whichbis why I switched to https instead (which has other issues, but at least most of the time it works)