Michael McCarrick has developed a DOSKEY program for the Model 4. For those who do not know, DOSKEY was a program for MSDOS which would store all of your command lines, and allow you to recall them with the up and down arrow.
DOSKEY for the Model 4 can be installed as a Extended Command Interpreter by copying it over sys13/sys. You would then use *+ENTER to use it.
Source and instructions are included. You can download it from the Search Page.