Methods are disclosed to support adaptive interaction with legacy software applications, without a need for rewriting those applications. The methods are for use with an interactive electronic system including a processor, a display, and an input device with user-manipulated controls. When the legacy application is executed, a supplemental software program, such as a plugin, is also executed and is utilized in order to identify currently relevant interactive features of the legacy application during execution. Functionality is dynamically assigned to the various user-manipulated controls based on the identified features. In one embodiment, detection of objects (particularly the user's hands) proximate to the input controls is also employed in determining the assignment of functionality and/or in displaying a visual representation to the user of the available interactive choices. In another embodiment, the user-manipulated input controls are dynamically and physically reconfigured under control of the processor based on the identified features.