Neat! See, I assumed that Ben was signaling the Orchid, but I bet you're right that he was signaling Richard, etc. at the Temple. Which would then also explain why he wasn't worried that the Keamy Krew wouldn't intercept the message. So when he said to Locke, "Who do you think", it was an answerable question. That is, assuming that you're right. I have a tendency to believe everything I hear/read.
Forgive me!