Some examples of things you can do with IFOEdit are eliminating FBI warnings, replacing video streams with lower bitrate ones, editing region codes, changing RCE protection and menu links and so on.
Power users can take one step further and access advanced options like checking the GOP structure, stripping the VOB IDs, splitting DVDs, creating new IFO files, eliminating DVD protection or creating new VOB files.
IFOEdit is mostly recommended to users who are familiar with DVD editing. If you are not sure of what you are doing, you can corrupt data and make the DVD nonfunctional.
By using this application, you will be able to eliminate undesired audio streams or subtitles and to use various other customization options.