No, I would never put content in a System Setting. I would put that in a chunk if I wanted to use it in multiple templates.
Think of System Settings as small bits of information for use by MODX processes around the site. They're very similar in function to properties (like the ones you put in a snippet tag) except that properties are local in scope (IOW, they can only be seen by the element they are attached to), wheras system settings can be seen from anywhere on the site.
If you browse through the MODX System Setting grid in Revolution, you should get a pretty good idea how they are used. The vast majority are one of the following:
- Boolean Yes/No switches (use Friendly URLs or not)
- Integers (how many minutes to block a use who screws up logging in)
- Paths (where is the rich text editor directory)
- Short text strings (what's the name of the rich text editor, what's the SMTP password)
Notice that these all answer some question a process might need to know the answer to.
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PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODx info for everyone:
http://bobsguides.com/modx.html