More KotorTool would indeed be good.
It's one of the staple tools of the Kotor modding community that it's hard to do without. Though the game is past its prime the modding community is still going strong.
Originally Posted by qui_gon_glenn
As far as a new release is concerned, perhaps you could add functionality for the ERF builder to select multiple files at one time to add to your ERF? Currently it's either a one-by-one, or whole directories at a time.
You can do that currently via drag and drop. Select the files you want to add in the Windows Explorer and drag and drop them onto the file list in the ERF Builder window. You can also do it by picking "Add files" and holding down the shift key while selecting multiple files in the Open dialog box (provided all files are located in the same folder).