Tips for New Jumpstart Pro Rails Customers

If any "more experienced" customers have pragmatic tips to share, such as do's and don'ts I would love to hear them! Some ideas:
- what changes have you made, large or small, that you wish you hadn't?
- what modifications might one avoid to ease upgrades from upstream, etc?
- common best practices at the app-specific vs jumpstart boundary
- must-have gems that have worked well for you
- security tips
- maintenance tips
Thanks for sharing!
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