From the tone and context I take it you have been a victim of what you describe?
As I said, you can try place all the blame on the Housing Officer (or me in this case) but I still maintain that the tenants should take some responsibility and do some research before bidding a property and refusing it before they even get through the door. If they have done some "homework" then it should just be a case of turning up, looking at the inside of the property and giving a yes or no, what do you need more time for? Pick out interior colours? Where are you going to put the TV? Those type of things can be reflected upon at a later stage.
Remember, no one is holding a gun to tenants heads say "take this or die", they can and do refuse (all to too often). I'd like to think (and maybe I've set my expectations too high) that someone who wants to accept a property has considered how it will impact their life (schooling, travel and other social factors).
With regard to your point about rushing tenants and a new transfer request. I have been in the sector for 9 years, I have let over 120 properties across all of London and do you know something,I've never had a case where the tenant has moved in and called me up to request a transfer again. Strange?
The transfer list never really shortens does it? Tenants apply every day, so it only grows. Remember once that new tenant moves in their old property is now void and the process starts again.