It is a HUGE body and head builder and it does have a notable taste. 1 lb in a 5 gallon batch is a lot of flaked barley and I don't think it will be a welcome addition. It will be difficult to serve in a reasonable amount of time due to the amount of head this beer may have. I would plan on carbonating the beer at a low level if you add that much.
The flavor of raw and flaked barley blend pretty well with roast barley. But in a relatively pale beer without that roast flavor, that flavor can be overwhelming. Use with caution.