Testing the TMK port on a PCB now, so far so good, the board itself is 20C, the MCU is 22C - so pretty much room temperature
So far only mapped Q and 1, however, even with all my actions and layers, the firmware was 22.5KB's - mapping seems like a breeze too, I'll share my experiences once I conclude things and test them for 1-2 days
Very excited to just leave this ps2avr stuff behind, I also tested ps2avrGB, and that didn't work with the usb-usb converter either, then I bricked my converter trying to use the latest TMK, the .hex size probably exceeded 30k, dfu-programmer doesn't check this before erasing, and after erasing, the converter acted like it's bricked - bootloaderHID seems to just check things beforehand which is good, and luckily, the TMK port was 22kb's
I also checked about what could be done to slow the polling rate, maybe QMK is different, or things changed after you tested them, on the matrix scan code, there seems to be a delay command, and on the vusb side, as I see, luizribeiro tested polling rates too, added a comment related to that - so I'm hoping for the best
Result: https://geekhack.org/index.php?topic=85943.msg2580149#msg2580149