Core Input Remapping not available in Retroarch GUI

Hi! This is a copy of an issue I logged with Retroarch - https://github.com/libretro/RetroArch/issues/2000 - apparently it is an issue with the core itself.

I'm trying to resolve this issue I have with the way that the FBA-lr core handles mapping neogeo buttons on a snes pad: http://blog.petrockblock.com/forums/topic/different-controller-configs-for-retroarch-menugames/

Essentially I can get a configuration that works right in games, but then it makes the buttons do different things in the RGUI - I want it to be correct in both, ideally! :) I'm told that the 'Quick Menu > Core Input Remapping', would solve this issue, but it doesn't appear in the quick menu of this core - why? It DOES appear in other cores, although I don't have issues with those :)

I'm running v1.2.2, with the latest version of fba-libretro

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Start at the Quick Menu > Core Input Remapping entry point and compare its availability for FBA-lr with the other cores mentioned in the report. Read the linked RetroArch issue and verify the expected behavior against the reported FBA-lr and RGUI controller mappings; done means the remapping option is available and both game and RGUI mappings work as described.