The browse button can be used to add only a single remote directory to the search path. Multiple paths can be added in the property field by separating the directory paths with a "|" (not ";").
In the Macro search path field, type:
This option gets passed to the NDGBuild command line as:
-sd C:\projects\macro_dir1 -sd C:\projects\macro_dir2
Alternatively, the Macro Search Path field could be entered as a string:
C:\projects\macro_dir1 -sd C:\projects\macro_dir2
This will result in the same command line because only one leading "-sd" switch will be added to the front of the path.