In the NXT webview Duplicate Management, please allow the merging of more than one record at a time. The tool is very helpful but it takes a long time to merge each set of records.
The goal would be to select multiple (or a set of) duplicate pairs and merge them with one action, or create the ability to define a threshold that would drive auto-merging of constituent records.
Blackbaud has a Mass Merge Tool (plug-in in database view), that you have to subscribe to (aka pay for). This is another one of those areas where they likely won't give you the keys to the kingdom without ponying up an added price. <sigh>