gaskets:to goo or not to goo?

["Andy Webster" <trunkie@hotmail.com>]

should I be using gasket sealant/cement on such gaskets as front and rear 
engine cover plates?
If so, will a smear of hi-temp silicone suffice?
Has anyone ever compiled (or know of) an ordered list of assembly operations 
to eliminate having to undo something that was done too soon? The manuals 
don't set it out like that...
Andy