Like a "delete save" button in the menu?

or a "load map" button? (so I don't have to minimize the game to manually search through the maps folder for the map name to paste into console?) 

there is a “maps” command that prints a list of available maps. 

to only shows the maps in the current mod?

currently seems to list all maps, including in the ID1, which might not be mod compatible 

Also can the old school quake underwater effect be brought back as a "r_waterwarp 2"? 

Macs applications can't do command line parameters.
Hmm... since when ? But i believe you. macOS should have it's Unix accrediation revoked. It's a disgraceful clusterf*ck of a design mess with no regard for anything but making a buck, lock-in, and selling disposable hardware. I turned off about 4 years ago and just run Mojave on my household laptops. Now get off my lawn :) 

@ranger
to only shows the maps in the current mod?
Sounds reasonable... Currently shows all maps in id1/maps (which in my case is quite a few) mixed up with mod maps (shoved into 'extralevels').

Maybe i'll code this ? Probably easiest to do something like "maps_mod". Just had a quick look. haha, geezus our data structures are basic.