Emedhtml.exe is an executable which simply opens the command line file with EmEditor with HTML configuration, and it is used to open HTML source via Internet Explorer “View Source” command.
Did you know you can access plug-ins via Toolbar. They can be also accessed via keyboard shortcuts after you assign them to keyboard (from Keyboard Map).
You might want to search for macros or plug-ins that suit your needs. Since each user has different needs for the editor, those features are not included in the core features of EmEditor.
I am also adding new cusomizability in future versions, including ability to assign a toolbar button to a macro, which will allow you to further customize EmEditor for your needs. If you could not find what you need, please write exactly what you need, or email me, and I might create a plug-in or a macro to satisfy your needs. Thanks!