1) Currently, I have about 1000 EasyBlog posts, each of them with between 4-10 tags. Since there wasn't a way to "lock" the tags, there's a tremendous amount of duplication here, making it impossible to create one menu item displaying all relevant tags. Thus, I'm excited to move to a more structured database format. However, the question is how to convert all the old tags over? A few ideas:
a) Do you have a script for combining multiple tags into one? (For instance, automatically replace "gluten free," "gluten-free," "Gluten-Free" and "glutenfree" with "gluten-free"?)
b) Is there a way to assign extra field values in bulk, at least manually? Thus, I could search for each of the above variations on "glutenfree" and then auto-assign the 'gluten-free' extra field value.

"gluten free," => "gluten-free," 

"Gluten-Free" and "glutenfree" => "gluten-free

2) As a related question, how can content be displayed based on its extra field values? For instance, EasyBlog ships with the ability to set a 'menu item' for a particular tag; do you have plans to add similar functionality to display content based on a particular extra field value? Ideally, one would be able to select a combination of parameters to display. It would be even more important to be able to do this for a content display module - currently, a number of third party providers offer content sliders that support EasyBlog tags (RokSprocket from RocketTheme and SmartSlider 3 from Nextend come to mind). Setting a combination of parameters to display EasyBlog posts is an absolute necessity for my site. I'd really appreciate hearing what your plans are in this regard.

// Replace #__ to your table prefix 

update `#__easyblog_tag` set `title` = 'gluten-free', `alias` = 'gluten-free' where `title` in ('gluten_free','Gluten Free','gluten free','glutenfree');