After you select multiple notes using the Time Ruler, you just do a copy and paste rather than a drag & drop. The copy and paste method works nicely in Sonar (unlike some hosts) because you can easily set the paste point by clicking the time line. No need to switch to the Group Select tool.I was able to select multiple notes this way, but I wasn't able to drag and copy those notes. In order to do that, I still needed to go back to the direct selection tool.
Works like a charm.