Document Tagger have a search function

When you are using the document tagger to get the merge tags for generating documents, it would be really handy to have a search function. We have a complicated workflow and between form variables, workflow variables and SharePoint variables we have approaching 1000 variables, so to manually scroll though the list to find the document tags is painful and time consuming. There is a search function implemented for the variables browser normally, it would be great to have this function carried across to the document tagger function.