Interesting idea. I think these are good suggestions for a new product, as this product here uses
- tag cloud template
- and search results are done with tag.php
Your integrated approach would
- use forumdisplay template standard filters
- therefore search results are done with forumdisplay.php
It would be also grow into a bigger product as then you need some new styles for integration. The easy thing now is that we do not do anything more than just show standard tag cloud below navbar with only changes that only threads within actual forum are displayed.
On another side it is hard to explain to our users what tags are and then it is hard to differentiate between prefixes and tags. So it would be easier to tell them "Tags are something you can add to every topic. There is always a tag cloud, you click on it and get all threads tagged with this tag"