Use /setfilename mymapname to set the "internal map name" . Then, use:

F2 to save the map
F3 to (re)load the map
F4 to save and send the map

These three commands will use the "internal map name", which must be set by /setfilename.

These commands won't save/load/send the map instantly. They will show a prompt with the command ready to be executed. You must press "enter" to confirm the command.

I think this script is VERY useful when making maps. It is much more easy to save/load (or send, if coopedit) using these commands.

People who will look at source code will note a lot of comments like // {{{ and // }}}. Don't worry, there are just marks used by vim editor to "fold" the code.