To customize the number of rows displayed within your LOOP Storage inline visualforce page use add the following syntax to your VF page:
rowCount ="[desired number]"
Below is an example of the entire inline visualforce syntax which will display 7 rows of records on our custom Payments object:
<apex:page title="Documents" showHeader="false" sidebar="false" standardcontroller="Payments__c" extensions="LStore.storedDocInline" id="aP">
<LStore:storedDocInlinePageComponent componentController="{!customControllerInline}" rowCount = "7"/>
</apex:page>