Load Macro Parameter from File
When configuring a macro item, each parameter's value has the option of "Use preset value" or "Derive from prior response".
I'd like the capability to load a parameter's value from a file at runtime by specifying a relative path to the file. I often use saved states to automate scanning and have macros to re-login to an application. I would like for people to be able to change the username or password without having to open Burp, load the state, modify the macro, and save the state again. Instead, they could just modify the contents of the text file that Burp would look at for that value.