This is also my scenario. Love my 350 but I too have 2 or more component sources but only one way in.
I also have a DVDO Scaler/Switcher that can switch 2 x component, 2 x S-Video and 2x Composite sources BEFORE the Slingbox input.
So this is a wishlist for the future;
PLEASE allow for more than one remote on the Slingbox component input. Today I could have several different devices going into my Slingbox 350 input but I need the option to assign the right remote to control the Freeview TV decoder, Sky TV and/or Blu-Ray player that will go in to the Slingbox's one component 'pipe' thru my DVDO switcher.
It could all be very easy if there was the tool of an 'Source Option Remote' available to Slingbox owners.