The test results you have selected are very old and may not represent the current state of Wine.
Selected Test Results (selected in 'Test Results' table below)
Adding links via pasting from clipboard, file, and pasting one at a time is flawless.
Changing the order of the downloads works, as does using the options to configure usernames/passwords for all the sites supported by RapGet.
What does not
What was not tested
Only Rapid Share and Megadownloads links were tested, but I have no reason to think the others would not work as well.
The information tooltips that rapid share creates when events occur, such as successful downloads, often remains on the screen, regardless of where RapGet's window is moved to. Closing and re-opening RapGet removes the tooltips.