Too little memory in Android NAND ROMs. Cannot install apps!

(I was about to ask it here, but since I found the answer I'll share it too) After installing Android on NAND on my HD2, I found that the available system memory is too little for everyday use. It's around 180MB and after a few applications I need to move everything (manually) to SD card. I would like to have more space for system, especially if I have a large (say, 8GB) SD card.