There are a lot of templating languages: Pug, Swig, pure.js, Nunjucks, Underscore, Mustache etc. We don't believe there is a single right choice, it depends on the situation and desired complexity, so we chose not to have a built-in templating solution. However, we have recipes for implementing some of them, so you can use them as references.
While we understand that this is often useful as the scaffolded project grows, we believe it's a premature optimization in this case. If you're changing the project structure, most of the times a simple find & replace does the trick. Also, this feature is not very straightforward, it's not obvious what should be a variable and what shouldn't, so we think it's best to leave this one up to you. Read the whole discussion in #295.