I don't understand the walking time complaint. It's a necessity to effective planning. The longest walking time i've experienced was 8 minutes at Manchester Piccadilly which covered getting from platform 13/14, up and over the waiting bridge, all the way through the main station, through the gateline, through the concourse, out of the main entrance and around the back of an office block to the side of the station, then waiting for a lift or climbing up 8 sets of stairs to the kitchen and toilet facilities for a break. Between 7 - 8 minutes is about right for this depending on how busy it is and how long the lift takes, as long as you don't get stopped for advice by passengers etc.
Many breaks are 20 minutes long. Without walking time, 8 minutes there and back would leave me 4 minutes for the break, within which I have to use the toilet, prepare and eat food, clean up and take a rest before starting work again.
The walking time allows for diagrams to be planned efficiently, making sure that staff are back where they need to be on time, not causing delays to the rest of the network because they spent 2 munities on the toilet and 3 minutes eating when their diagram only allowed for a 1 minute toilet trip. At smaller locations, walking time is usually 3 minutes to move between the break facilities and any platform. Again, this seems reasonable to me.
If you remove the walking time, how do planners know how much time to assign to staff to ensure they can actually reach the required location on time?