Some yes, some no.
Scrivener seems to behave very oddly, at first blush.
Many of my RTFD documents are selected text/images captured from Web pages. They are RTFD. I can drag them to the Desktop, or to the TextEdit icon in the Dock, or to the iText Express icon in the Dock. Works great.
But if I drag them to the Scrivener Dock icon, or to the Clippings folder, or to the Research folder, they are converted to Web pages, complete with all the material that I hadn’t wanted to capture.
Of course, DT Pro retains in the metadata of those documents the URL of the page from which the capture was made. Without haven asked Christian, I’ll speculate that when version 2.0 is released and I can have multiple databases open, the metadata will accompany dragging a document from one database to another. Apparently, Scrivener "sees’ the document as HTML rather than RTFD, based on the URL. Note that if I delete the URL from the document’s Info panel, then drag it to the Scrivener Dock icon, it is captured as a Clipping, but in RTFD file format.
If I drag one of those RTFD documents to the insertion point of a Scrivener page, the contents appear properly.
On the other hand, RTF documents created in DT Pro can only be captured as Clippings. But once in the Clippings folder, they can be moved to the Research folder.
Note that if I drag one of my RTFD files that resulted from capturing selected text/images from a Web page onto the Safari Dock icon, it behaves like Scrivener. Safari “sees” that URL and opens the referenced page.
So, in answer to your original question, can interapplication dragging from DT Pro be improved, my inclination would be to respond that it would be a mistake (especially for future development) to change DT Pro’s behavior.
Scrivener is set up to convert some file types on the fly, and in the case of DT Pro files can “guess” wrong. There are workarounds, e.g. drag some DT Pro file types to the Finder, then drag the Finder file to Scrivener.