Amyotrophic lateral sclerosis case analysis

Hello, I have some problems with a case. What exercises should be used? All I can think of is passive ROM and maybe isometric exercises, thats all...
Its not an early stage, so I hardly find any research articles about it (im a physio student).

The case: ALS started 4 years ago. Patients muscle strength arms and legs 1/2 points. Movements restricted through all large joints. Patient cannot walk, can turn to the side, but very slowly. Can move his fingers a little and press TV remote buttons. Can move distal part of legs a little bit. Lung ventilation is used.

Objective: to increase ROM, prevent contractures and maintain muscle strength. (I think so, dont know if I am right :p)

Thank you for you answers.