Eehh well yes.. Thats basically about it, together with the capt-cha problem.
I followed these instructions from this German website; http://www.stephan-frank.de/board/index.php?topic=2.0
.. It's 3.0 code though. Not that it is much different from 3.1 or 3.2. Some people pretend like that a lot is changed but the core code is still the same. (Hence the .1 and .2 suffix).
My forum is that much altered that I don't want to update to 3.2.. I tried though! But then I discovered that 3.2 has a cron running which changes every posting in the database in favor of this new Twig template engine stuff which I do not care about to begin with (yes, sorry).. And there is some massive extra file usage overhead and parsing which is not needed in my situation. I simply like the old template system, it's not bad, just harder to learn.
So anyone who likes to stick with 3.0, or 3.1 ... It's pretty easy to do, just some small changes need to be made to make it PHP7.0 compatible. (7.1 or 7.2 I do not know, it doesn't make sense for me yet to upgrade to those PHP versions).
The only major problem is Tapatalk, which I chosen to keep running in a PHP5.6 environment until somebody creates a better phone app for phpBB.