This is the default behaviour now.
The db is only a cache of the current contents in the Org files, so this would be really strange.
Not sure, but doesn’t sound terribly hard.
For this, we need to extend the spec of the fuzzy links with additional separators. If we were to go with org’s link types, that restricts us to only 1 link tag per link. The tags will need to be kept in the link description upon resolution. We can come up with a simple proposal, like
[[Title*Headline::tag1::tag2]]
Then we can consider implementing this, but I’m wondering how much interest there is in this feature.