Situation: AlterEgo replaces shortcuts that allow to start applications directly.

Experienced: Often, at least for the multimedia category, the user starts the application by double-clicking a document instead.

Expected: AlterEgo should modify file extension settings as well.

Basic functionality added; default action will be impersonated, but copies of all verbs will be kept for running non-impersonated.
Separate keys (e.g. AlterEGo.quicktime.username.mp3 for MP3s, instead of overwriting MP3File or QuickTime.mp3), with just the users .mp3 handler redirected to the new handlers key (default value in \.mp3 pointing to those mentioned in previous brackets).