Can I use this to do ALL of the following?
a) Run all T4 templates ONLY on demand (from the VS toolbar button "transform" all t4 templates, and NOT concurrent with a build)
b) AND excluding 1 particular template?
a) There's no on demand setting. There's before or after build. b) Yes, but only if you're not using the new csproj format for your projects (e.g. Core or NETStandard projects). The method for adding the required options to the properties dialog for the templates doesn't work in these projects, and I haven't been able to find out why. I am fairly sure it's because the new project type has a different "CatID", but I haven't been able to find out what it is.