1.7.2 release notes
Input remapping system improvements
The input remapping system (available from Quick Menu -> Controls) had many obvious limitations previously. Some of these included:
It was not possible to map keyboard from more than one gamepad (for instance with Dosbox)
It was not possible to map more than one button to the same action
It was not possible to unmap buttons or analogs
It was not possible to map a button to trigger an analog response (for instance, in an N64 emulator, running in Super Mario 64 with the D-pad)
It was not possible to map an analog to another analog
It was not possible to map an analog to produce a button response
Most of these restrictions have now been lifted at long last thanks to radius, and the visual representation is also much improved now.
To read more about this, also visit the related forum thread here.
Do note that all your existing remap files are now obsolete, and you should start from scratch. This was a necessary evil unfortunately in order to progress.