I am doing that now and it appears to be working well.
I took it a step further to allow my users the ability to "Copy" a file to the share where SMartDL 4.0 looks.
I have of course instructed my users to name the file, exactly the same and to agree to overwrite the file when prompted.
I have the entire "Manual uploaded Jobs" OU scheduled to update daily, so if a new file is there, it will use it to update.
I have found that minimizing the columns of data that the user file contains is best practice,
JON