The optional "target" and "windowFeatures" params on the Redirector module do not seem to give me enough flexibility. Using "target" always requires something to be passed into the window.open() "spec" parameter. If the "windowFeatures" param is not supplied a default is provided. This implementation seems to always cause the redirected page to open in a popup window.
If there was a way to tell the Redirector module to use a "target" and not provide default "windowFeatures", then window.open() will have the possibility to open in a new tab depending on browser settings.
However the problem that window.open() is inherently limited to opening new windows rather than new tabs. Worse, even for standard link clicks, whether to open a new window or a new tab is actually a browser setting and not something that the web application is traditionally able to control.
bottom line: It's in the queue. Not near the top but so that it should appear in a month or two and I'm fairly optimistic.