@Cesar92
I had a similar idea, however {option} will still translate any given value into a command line switch.
So, ue4dt must accept this command line:
Code:
ue4dt.exe e -m2 key <stdin> <stdout>
If you used {option}, a - will be appended to the key, making the run command:
Code:
ue4dt.exe e -m2 -key <stdin> <stdout>
leading to an error.