Theoretically I think you could define the SCOM database in the dap probe and then build queries for it using the dashboard designer. I have never tried anything like this myself though. Otherwise maybe you can get any data you want from SCOM into the NiS databsae and then query it there using the dashboard designer.
Sorry I don't have any more specific ideas or instructions, but maybe someone else has tried tying in information from external databases/applications like this.
-Keith