Another thought about threats...you can always put them on Merry and then put him back in your hand.
Still, Weapons Store is pretty necessary in a Rohan deck. I kind of think that Rohan is hardy enough to not really need the excess healing of
King in Exile and guys like Theoden actually help you when they get killed. A benefit to
Merry, Swordthain that might make it worth keeping one copy in there is to grab back some of the mounts or Javelins, but again...I really just don't think four copies is really necessary.
I don't know what I could do to convince you Boromir is a good idea at Ring-Bearer. But I am ready to try!
Edit: I forgot, if you play
Boromir, Bearer of Council as your Ring-Bearer, then you can play
The Red Arrow. And nothing is more convenient than playing a
Rohirrim Army and discarding a minion during the assignment phase!
-wtk