Are there any plans for a sitewide tags suggestions feature on the roadmap for this plugin?
I stumbled upon this old (and hackish) plugin which claims it offered this functionality, but editing core files is not the solution I'm looking for.
I'm interested in this particular feature as a solution for a client of mine. I might be able to work on this for them. Would you be interested in adding such a feature and do you have any thoughts on how to implement this?
I have some experience in developing sitewide solutions, see the bbAggregate plugin which aims to do something similar as what your plugin offers.