Hi there!

I am still very new to the Skyrim Creation Kit. I would like to know if it's possible for me to change the behavior of NPCs, in particular vendors. I know I can use the package stack to line up behaviors like sleeping and eating and so forth, but can I make a package from ground up through papyrus? For example if I wanted a vendor to suggest me an item instead of showing me the usual vending interface (yes, I know I have to use SKSE to be able to change the UI)