If you copy the rule it will remain even if you remove vBundle.  I generally copy them and call custom rules "Custom - Rule Name...." or "CustomerName - Rule Name".  There are plans to review some of the vBundle bits to add the product, but most of his custom work has already been incorporated via new metrics and enhancements to drag and drop dashboards.
When I upgraded to v6.7.0, I had a performance issue which was preventing consistent data collections.  One item that *seemed* to be messing things up was the vBundle and Velocity cartridges that I had installed.  After uninstalling, things were better but still needed some additional JVM memory tweaks to make the new version reliable.  Now I find myself really wanting the dashboard objects that these cartridges brought to the table.  Is anyone running them successfully under 6.7.0?
vBundle and 6.7.0 - Compatible?