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Reference root path should be project
If you add a <reference path="/" /> to include all files in root folder, it appears like c: is scanned recursively?
The current visual studio project could be the root here, so the only needed reference is the line
<reference path="/_references.js" />
in all test files
Another useful feature could be configurable constants, for the case where you have your tests in one VS project, and the target in another.
<reference path="$TargetProject/viewmodels/myViewModel.js" />
A settings file could contain these settings and be included in the solution to share the settings in the team.