Other PSTL Modifier/Combiner tools (some of which are now available directly in GP like for Vendors and Customers for example) have the ability to manually enter more than one item at a time or better yet, Import a file that allows making mass changes to vendors, customers, GL accounts, etc... However in the Fixed Assets modifier, there is no "Import File" option and each asset must be entered and processed one at a time. In the past when needing to make mass changes to Fixed Asset ID's, I have used a combination of macro & mail-merge to automate this process, but it would be better, faster, easier, etc... if the functionality was there like it is for many of these other tools.