The attached patch bumps the version to 1.1 sets the homepage to bitbucket site set spinner model: >= 0; step 50 Defines a custom spinner editor to workaround bugs when manually entering number (could miss persisting input). Also the editor only allows digits to be input.
I've finally had the chance to use the JFormattedTextField; hope I never have that opportunity again.
FYI, I decided to incorporate a blink rate setting directly into jVi since it has mechanisms for installing settings dynamically so that all mime-types are affected.
If I ever have to figure out how to get a list of all mime-types; I could revisit this plugin and add a list for which mime-type to set, along with an "all" option.