I have some changed files I don't want to commit (e.g. web.config). Before I pull and update to new changesets, I have to shelve them. After the pull & update, I have to unshelve them.
I'm currently using TortoiseHG. Is there any extension which can do this automatically?
I'd suggest something else: instead of always shelving and unshelving, you could use two different config files: one which is part of the repository and contains dummy/example data, and another one which each user really uses locally, which is ignored by Mercurial.
Check out this answer for a more detailed explanation what I mean.
The example I'm giving there is for Visual Studio, and I see from your other questions and answers that you're apparently using .net and Visual Studio, so you can just use my example exactly as written.