Contrary to popular opinion, liquid smoke is not of the devil!
It is used as a flavor component, especially in sauces. Not all sauces go on "bbq". You can add/remove any item you wish but then it's not the recipe you started with.
I had a case once where a friend asked for the recipe for my grilling sauce and I gave it to him with all components! (Didn't pull an Aunt Bea and leave one out!).
He tried it the next weekend and told me it didn't taste the same.
When I reviewed the recipe he told me he'd replaced the white pepper with black pepperr...well, duh, it wasn't the same since the white pepper is one of the necessary flavor components for that particular sauce.
Anyway, good luck and as always: YMMV!