On project chat, we have links for "edit" and "edit source". "edit" = visual editor.
With visual editor, I want to indent to respond to a thread. Hitting tab to indent does not work although typing ":" maybe works (makes a block quote?) and I can't add my signature.
Can visual editor add support for these things? If not, is there a way to disable visual editor on particular pages like this? else the entire namespace?
Can visual editor add support for these things?
Sure. I estimate 1–2 years' time.
If not, is there a way to disable visual editor on particular pages like this?
Not currently.
else the entire namespace?
It's only on in this namespace in the first place at the specific request of @Lydia_Pintscher for editing this page…
wonder how edits like https://www.wikidata.org/w/index.php?title=Wikidata%3AProject_chat&diff=200207987&oldid=200207707 are made in visual editor? particularly signing one's user name...
It wasn't. VisualEditor adds a change tag to each edit made with it so we can tell.
https://www.wikidata.org/w/index.php?title=Special:RecentChanges&days=30&from=&tagfilter=visualeditor is a list of all edits made with VisualEditor on Wikidata in the past 30 days (remember that it's opt-in for this reason :-)).
As for signatures, there's a gadget available: https://meta.wikimedia.org/wiki/User:Matma_Rex/visualeditor-signature.js. No promises, but it was working last time I checked.