No, once you lose your 5% they only ask for maintenance. I have chosen to try and get down to a BMI of below 60 to improve my chances of a safe op as a personal goal because the weight is coming off at the moment. I have so far managed to lose almost 3 stone (am 1 lb off - frustrating!!) so am hopeful that I can get that bit further.
I don't know if they are short staffed, but they seem to have a very high demand. Most people I know are looking a few months from surgeon to surgery. Also bypass is becoming more popular now.