Using Prepare Form to Create Fillable PDF Except for Specified Pages

You can use this code to do it, but notice it will only work on fields that have a single "widget", ie. not for fields with more than one instance with the same name:

for (var i=this.numFields-1; i>=0; i--) {
	var fname = this.getNthFieldName(i);
	var f = this.getField(fname);
	if (f==null) continue;
	if (typeof f.page=="number" && f.page%7==0) 
		this.removeField(f.name);
}

I don't believe you can select the pages for auto detect, but it's easy to delete any fields created on the pages you didn't want them on by selecting all fields on those pages in the field panel and pressing the delete key.  If this will take too much time because you have too many pages you can run a script in the console that will delete them for you.