I don't believe there is a way as it is also grayed out on my core. I am running version 2016.
If you are running an agent prior to LD 2016, then you can crack open the agent and modify the baseagent.mpkg. In the LDMSClient.mpkg/Contents/Packages/baseagent.pkg/Contents/Resources directory, there are a few files that you can look at to modify this. With 9.6 SP2, it looks like you would want to ldcron.default.xml and ldcron.xml files.
I used to modify every agent to lower these numbers and also add a -e -s to the ldiscan command but have not since upgrading to 9.6. Support frowns on modifying the agent files when support is needed .
If you are running LD2016, I believe they have done some locking down of the agent in a DMG where if you try to extract and modify the agent, it will not install correctly. I have not tested this yet as we are still on 9.6 SP2.