darrenSP - You can easily update the confirmation message from a text editor. 

Below is the text key used for show Thanks for your feedback message. 

page.RatingEnumerationDisplay.feedback.success.title

Studio -> Text Editor -> Community Text 

Lithium uses the text key for each string appearing in the community.  You can search for the string you want to update from there. 

https://community.lithium.com/t5/FAQs-email-templates-and-text/About-text-keys/ta-p/109029

https://community.lithium.com/t5/FAQs-email-templates-and-text/Find-text-keys/ta-p/109027

Regarding the custom component for this, there is no POST API call available for helpfulness, you can only perform GET action. 

https://community.lithium.com/t5/Developer-Documentation/bd-p/dev-doc-portal?section=commv2&collection=tkb_helpfulness_ratings#constraints-message.id

The page object doesn't support that.    Instead, use the http.request context object which does have a url method.   Using that along with the Freemarker contains built-in can do what you want.   For example:

<#if http.request.url?contains("/t5/path/to/page1") || http.request.url?contains("/t5/path/to/page2")>
    <code for special pages here>
</#if>

You could wrap the breadcrumb in a div that is hidden (display:none) and then have your javascript un-hide the div after it has adjusted the breadcrumb.

Another approach you can take is to create a custom breadcrumb, using the freemarker objects we have for working with the breadcrumb (so all your logic is run server-side).  Here is information about the freemarker breadcrumb context objects we have:

<#list page.content.nav.breadcrumb.crumbs as crumb>
  <#-\- do something \-->

${page.content.nav.breadcrumb.css}

${page.content.nav.breadcrumb.separator}

${page.content.nav.breadcrumb[0].text}

${page.content.nav.breadcrumb[0].url}

<#if page.content.nav.breadcrumb[0].isLink>\\
  <#-\- do something \-->\\

${page.content.nav.breadcrumb[0].wrapperCss}

${page.content.nav.breadcrumb[0].css}

${page.content.nav.breadcrumb[0].separatorCss}

${page.content.nav.breadcrumb[0].type}

Here is an example of putting all of the above context objects together into a custom breadcrumb:

<div class="${page.content.nav.breadcrumb.css}}">
  <ul>					
    <#list page.content.nav.breadcrumb.crumbs as crumb>
        <li class="${crumb.wrapperCss}">
          <#if crumb.link>
            <a href="${crumb.url}" class="${crumb.css}">${crumb.text}</a>
          <#else>
            <span>${crumb.text}</span>
          </#if>
        </li>
        <#if crumb_has_next>
          <li class="${crumb.separatorCss}">
            <span>${page.content.nav.breadcrumb.seperator}</span>
          </li>
        </#if>
    </#list>
  </ul>
</div>