In fact the forum new organization is not finished yet.
I would like to remove Support/Extensions (ie moving all its content either in Support/Troubleshooting or in PB/Engine or PB/TT).
Please note that Engine != core. Engine is about general coding in Piwigo. Today the main activity is plugin coding (and that's a good thing), but unfortunately the previous Extensions section was containing some user related topics and some coding related topics. They should not be mixed.
What difference do you do between the posts in Project Building/Templates and Themes and Support/Extensions. It will be hard.
My real question is: what do you expect in PB/T+T that will not fit in a Support forum ?