HI Alarr,
SyncToy does NOT provider this feather, but I assume that Create a autorun.inf files in your USB Driver root path and Run SyncToy Command line can work around it.
About
Command Line option for -silent, please take a look at here:
http://social.microsoft.com/Forums/en-US/synctoy/thread/e6e4ad8f-81c5-47cd-8c03-5eea4038a075Please let me know If need more help.
If it's worked for you, please share out your experience. thanks. :)
Joey Liang
Your potential our passion
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