Hello
I wondered for some time how to add an "embed" checkbox to the import dialog, but it wasn't necessary - I used the extension parameters feature.
I fixed the embedding of images in the following way: 1. If a bitmap file is imported, a dialog appears that asks the user whether to link. (Same when opening a bitmap image.) 2. When a bitmap file URI is dragged over Inkscape's window, a dialog appears as in 1. 3. When pixel data is dragged over Inkscape's window, it is embedded an no dialog is shown. 4. When a bitmap file URI is pasted, nothing happens (for now) - that's because the clipboard doesn't support URI lists yet. 5. When pixel data is pasted, it is embedded as in 3.
As a bonus, all bitmap import should now use the same code path.
Regards, Krzysztof