Enable easy switching between Roman, right to left & Japense feature sets
InDesign can be set to either Roman, right to left & Japense feature sets at time of installation.
Multilingual designers often have to work across multiple languages that range across reature sets.
I suggested to include an option in the settings that easily switches between these feature sets. This information is stored in the Windows Registry and in the applicationpreference.plist file on macOS so hopefully would be relatively easy to implement.