If I’m understanding what you are requesting, you would like a GUI that would allow you to edit/create custom profiles based on the available values detailed in MCEBuddy - Understanding Profiles Basics and MCEBuddy - Advanced Settings, Commands and Tweaking.
This would be pretty cool and probably very hard to maintain due to all available combination of parameters that ffmpeg and handbrake offer. But if you exclude that ability the framework of what is within a profile entry is set by MCEBuddy so basics could be available to manipulate via a UI.