There are (were?) a number of folks (myself included) who would appreciate this device but only after adding the features you mentioned. I don't need needle search, but it is handy. Manually selecting cue points, and a track profile display that shows them along with the hot cue points set in rekordbox is a requirement for me. My preference is that they are shown on the device, but bouncing that control or data to a smartphone or pad would work (so long as those things are not in the signal chain.)
None of these items are new requests, btw... we are still waiting.