Also I would like to have multiple sitemaps, as some pages change quite often while others don't, with some being brand new pages each day. What is the best way to go about this?
You can setup multiple instances of sitemap generator for this.
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Multiple instances? What do you mean? separate folders with the app duplicated? Or can you just run the app and specify a profile/config etc?
Also in the docs you might want to make it a little more clear that the sittemap.xml file(s) needs to be in the root of the sitemap reported in Google sitemaps and those files need to be manually created and permissions set on them individually when setting it all up(and not the folders). Any Linux/php/SEO guru would know this, but even I kinda had a brain fart and forgot despite doing LAMP stuff for many years.
Thanks for the help