What is the importance of Run time settings? And what changes you can implement in run time settings?

There are few important settings you need to know in run-time settings. 1)Run logic: Here we give number of iterations that a script has to run. 2)In pacing we give the intervals between each iteration(in secs). 3) In Log: we have standard log and Extended log. Extended logs are useful when you need to capture parameter, correlation logs as well. 4)Think time settings mostly either ignore think time or replay think time. 5) In preferences you can configure time out options, you can change from 120 secs(standard) to 1000 secs.