Is it possible to code a shell extension/property handler to enable editing of a directory's Comments/InfoTip via Details pane?

Question

A file system folder can have text assigned to the Comments property/column via a desktop.ini file entry:

[.ShellClassInfo]
InfoTip=Hello World!

and, in addition to populating the Comments column, can be added to the 'Details' tab of the folder's Properties dialog and the Details pane by editing the FullDetails and PreviewDetails values under:

• HKCR:\Directory

and inserting System.Comment in the semicolon-delimited property list. With that, Explorer is able to get and display the property, with the Details pane even seeming to allow editing:

But when Save is clicked:

• Error 0x80004002: No such interface supported

  

So there's a "getter", but no "Setter".

So, at this point, hoping those with more experience can tell me:

1. Is this possible?
2. Where should I be focusing my attention in the MS documentation? Since there's already clearly some property handling going on, can I extend the existing functionality? Or will I need to re-implement what's already working in my own code?
3. Can this be done in C# or would I need to dive into c++?