#else path not needed, we require Qt 5.5

Unused?

Just remove Qt::UserRole+2 and the enum values below.

I've just adapted what was already there.

It seems the developer of the plugin has used the different Qt::UserRole as keys to store multiple configuration values in a single QStrandardItem?
So it might be not a perfect solution, but removing the "keys" would cause a lot of work?

I meant just removing the enum values, not the enums themselves. Hard-coding the values in case you just want normal numbering is not necessary.

Example:
enum { A = 1, B, C }; => B will be 2, C will be 3 automatically.

Ah, sry - misunderstood , I thought you meant to remove the lines or even the whole enum...