Motel upgrades will only be available once you have found out about the extra room for rent in the motel, adult TV channel (in both rooms) and bathroom lock (in both rooms).
Model job will refill the job request only when you have found the job in the first place. You need to open your phone and use the browser to search for jobs (4 times) and then go to the photo studio to chat about the job. Find a model to complete the job, then use the cheat mod to get another photo job instead of searching for it again on the phone.
In short, the mod is working.
You can test it by pushing the - or = key at the top of the keyboard and you should see the time change with each press of the key.