Dan
In my experience and knowledge Ti can cause problems with corrosion depending on what metal it is next to, ie, Ti seatpost getting stuck in aluminium shim ! Coating of copper slip / copper anti seize is defo needed.
Also, as far as i am aware Ti components can cold-weld themselves together over a period of time, ie Ti bolts in Ti components.
I run a Litespeed with Moots post and bars, and a Litespeed stem and have replaced all the bolts with stainless. Not much heavier and very strong.
PS, I have snapped a few Ti bolts over the years !!!!!!!!