I've got a suggestion, it would be great if the fullscreen will be a true fullscreen. Now, when you're using fullscreen it scales up to 80x25 (or smthng like that), and the game is on the right upper corner of the screen, if there will be zoom it will be much more playable and it wouldn't be so annoying like it's now. And, as far as i can remember, f you're playing linux version of doomrl there is the same bug/glitch/feature i don't know. When you're playing in a naked console it surely annoys. I want to use my tty and play doomrl with true fullscreen.
P.S. At first you should make macexecutable file. this file contains all lib f.e. symlinks for SDL and so on, in the main folder there will be Info.plist MacOs(folder) Resources(folder) and it will be a true mac way.
P.P.S. If you want, I can help you with mac port.