I still don't know exactly what they are, but I've been deleting them without any ill effect so far.
I haven't tried this either, but in the Core registry, under HKLM\Software\LANDesk\ManagementSuite\MBSDK there is a REG_DWORD value called "Store Async Files" and the data is "0x00000001" - I would assume changing this to 0 would stop storing the files after a reboot.
To quickly delete them, I made a little batch file and put it in the directory containing all the files. Here's the code:
ECHO Deleting MBSDK files from directory: %~dp0
del "%~dp0\*.*scan" /f