allow triggers/loops to understand seconds

[wellloaded]

crontabs in general are not meant to go down to seconds however there are some rare cases where this is a requirement.

On traditional crontab you can achieve this e.g. adding a sleep 15 before the command to run. I could replicate this with a delay 15000/30000/45000, however a control on the number of seconds (now) would be perfect. e.g. a "wait"

Please note I'm not talking about the main trigger, I actually run my script manually, I need some loops in the script to eventually align to those seconds.

So in short: could we have a more granular control on the triggers? In my particular scenario I need to run 1 script at second 0s and 30s, and a script 2 at 15s and 45s.

Thanks