No its not possible.
Because Crytek decided to be a bich and so you cant manually activate all the features you want unless your hardware supports it.
For your example ( Tessalation off but everything else on) but instead make all the features DX11 exclusive and lock everyone without Dx11 hardware and 32 Bit OS out.
Wait for some modders to make the "real" texturepacks.... and maybe they will add a DX10 support manually via the upcoming Editors.... unless Crytek doesnt **** this up as well.
For me personally this has made my decision to never buy a CRytek title again!