I am currently open to feature requests(yes does not mean now or soon!),but only if I know the system well.(SNES,NES,DOS,GENESIS=Yes)(Others=Maybe)(MAME*.**,N64,DreamCast,GameCube=No)
If I feel like this is a major issue or easy to fix I will likely fix it immediately.
(an example of this is the dosbox dynarecs being offline for over a year, not necessarily a bug but without those the emulator is severely crippled.(only runs 1/4 of the speed it could))
(Mednafen WonderSwan)Can rotate the display and input with select button
(Gambatte)Support bootloader emulation(to display original boot logo, GBC and GB bootloaders)
(mGBA)Fix x86 Android compile
(DosBox)LFN support (Long File Name)
(DosBox)Update to dosbox r4000(latest svn as of Oct 12 2016)
(DosBox)Update to newest svn (r4006)
(Snes)New snes emulator with threads(very beta,only uses 2 cpus when superfx is active)
(Snes9x2017)Make headered Roms work
(PUAE)Fix missing mac build
(BlueMSX)Support .dsk ROMs
(Pcsx_rearmed)Fixed crash on menu reset
(Pcsx_rearmed)Added display boot logo option
(PC98)Core Port(Neko Project 2)
(BlueMSX)Disk swap option
(FCEUmm)Add “blow on microphone” button
(PicoDrive)Storyware book/pen support
(DosBox)Use real threads/more than 1 cpu(will fix input lag when cycles set too high/fixes cycles=auto/max)
(PokeMini)Fix save states
(Snes9x****)Air strike patrol shadow fix
(Gambatte)Make motion sensor work in Kirby Tilt and Tumble(First make it boot in Gambatte)
(Soft patching)I may port a universal patcher as a core but soft patching is just a waste of time on every boot.(My opinion, I do not represent the views of libretro/retroarch as a whole.)
(Snes9x****)Sufami Turbo Support
(FM TOWNS)Core Port(****)
(DosBox)Input mapping sticky keys
(4DO)Save states ???
(Nestopia)4 player support
(WinUAE port)The description states I wont port duplicate cores, see puae/fsuae ports.
(Mednafen PCE accurate core)The description states I wont port duplicate cores, are there known problems with the fast core?
(Anything Netplay)I have no knowledge in this area.(This may change later)
(PSX)6xbrz for PSX core(this is not emulation related, this is for the frontend to deal with using a GPU shader, the cores just output the emulated systems default resolution framebuffer)
(DosBox)Save States(Complete rewrite would be needed)
(DosBox)Mouse input(This is an issue with RetroArch and happens in all cores that use mouse input)
(Video4linux / any non universal core)No, for me if it does not work on everything it might as well work on nothing.(That is the whole point to emulators is cross compatibility)
If there is a game system that is not supported and you want it ported to RetroArch, here is where to post it.
If the system is already accurately emulated and full speed on low end hardware I will not port another core for it!(If another dev would like to or not is up to them.)(I will however fix what is causing the problem on the existing core.)
As of May 4 2017 all posts requesting a duplicate core without a reason will be deleted.
If your reason is invalid I will help you fix the issue you are having with the current core. If there is a feature that emulator has over all the existing cores for that system it is a valid request.
Update Thanksgiving 2017
I have not posted here for a while, but this thread is not dead, just very full and out of date.
Recently I have got a NEW 2DSxl and am now providing support for 3DS issues, I will soon setup devkitARM and have just submitted a pull request with proper assets for 3 cores that where missing them.