Possible to prevent the run of whole file(or without selection)?

**Is your feature request related to a problem? Please describe.**
I am keeping the file with a bunch of commands, and most of the time i only need to run one or several lines after highlighted/selected command. But there were few times, the command run from the top to bottom unexpectedly. The frustration here are the reversal of the commands that ran accidentally.

**Describe the solution you'd like**
Possible to add the new settings that to prevent the run of whole file or without selection?