If that's the case, I stand corrected then. Last time I checked it was a pita to get games on that thing as you basically had to reprogram it for every single game, like an FPGA.
They probably don't implement it because of moral reasons, like Roxas refusing to implement signature patches in rxTools, the DeSmuME dev refusing to implement greater native resolution on the emulator, NTR CFW's dev quitting the project because he refused to open source it, among other things. Fortunately, Luma3DS is open source so anyone with the right skills can implement the cheats menu in Rosalina.