Any ideas (Jingoo support and others) can go into the issue system, labelled as proposal. If there are enough upvotes I’d be more keen to implement the features.
Logic in templates should probably come eventually, but for now. There are some more burning issues.
Regarding tags, they are called keywords in Logarion but those aren’t used for anything yet (will be used for searching etc). There are also topics which can be used to divide your blog and feeds into different… topics . The idea is that a blog will tend to have a small number of topics (3 to 10), but highly varied number of keywords.
So, topics are already usable by the dynamic server to see sub-lists of notes. They will also be used by the static generator to create distinct feeds, once it’s ready.