Q: Is there anyway to change the "simulate" button text to "Analyze"?

A: Yes. You can set the tool.action.label element in your tool.xml to whatever
you want the simulate button to display.

{{{
   <run>
     <tool>
       <action>
         <label>Analyze</label>
       </action>
       ...
     <command>...</command>
     </tool>
     <input>
     ...
     </input>
   <run>
}}}