Pumaboy, we have done that from time to time following previous incidents where passenger trust seemed to be waning. I expect we'll do it again when the 225 returns to service etc. My personal experience of that is that the passengers look at you with suspicion and are clearly thinking "what on earth are these guys doing here, why aren't they getting on with their real job" or "wow, things must be really bad because now they are sending the pilots down to try to sooth us".
Maybe it works for some, but not for any I have encountered.