I spotted this too - might be a point to ask Ian Craig about Lothian Buses policy on this issue, and work to getting a Transport Scotland Policy on cycles as mobility aids.
This would of course be a great idea for a study - how access to cycles as mobility aids has an impact on the health, social engagement, and costs of mobility for a person with a mobility impairment. From observation I'd reckon.
1) health - the opportunity to get exercise without loading up 'weak' parts of the body provides health gains.
2) social independence - the ability to go further and more frequently without depending on the services of a driver and vehicle, when the 'walking range is severely curtailed.
3) cost - personal cost in being able to afford fuel for a motability (says it all!) car, or taxis, or dial a ride bus. Public cost - underwriting 'special' bus services etc when standard bus & rail services can be used, plus greater use of standard bus & rail services, making these more viable.