Im seeing the datasheet for the aironet 1240, it show a feature called Link-role Flexibility, but I dont see any tech doc showing the configuration for this feature.
Link Role Flexibility
The autonomous versions of the Cisco Aironet 1300 Series, 1240AG Series, 1230AG Series, and the 1200 Series offer link role flexibility, which provides both access point and bridge functions through configuration of each radio as an access point, repeater, root bridge, non-root bridge, or workgroup bridge. This configuration flexibility enables the access points to address a wide range of applications, including basic wireless LAN coverage, wireless LAN coverage with wireless backhaul, and more traditional bridging applications.
From this Overview doc;
If you need some help with one of the "Roles" let us know :)
Hope this helps!