UI-O-Matic has a config file (\App_Plugins\UIOMatic\UIOMatic.config) where you can set the following options:

<?xml version="1.0" encoding="utf-8" ?>
<UIOMatic defaultObjectServiceType="UIOMatic.Services.PetaPocoObjectService, UIOMatic">
  <setting key="defaultListViewPageSize">10</setting>
  <setting key="rteFieldEditorButtons"><![CDATA[["preview", "|", "undo", "redo", "|", "copy", "cut", "paste", "|", "bold", "italic", "|", "link", "unlink"]]]></setting>
</UIOMatic>

Default Object Service Type

Ability to switch out the default object service type, read more on this in the advanced section.

Default List View Page Size

Default page size for the List View, on installation this is set to 10

RTE Field Editor Buttons

In this setting you can specify which buttons should be available on the RTE field editor