One way:
There's the "show module on all pages" option under module SETTINGS.

A better way:
It'd be more streamlined to create a "Disclaimer" page and simply add a "Disclaimer" link to your site skin that points to that page.  You could also uncheck "Include in menu" option for the disclaimer page so it will not show up in your navigation menu.  Doing things this way will make the link appear to function the same way as Term of Use and Privacy Statement.

 
Cheers!
-mamlin

Regarding the 90%....you can still use "display on all pages" and then go to whatever pages you don't want the message on and delete the module from those pages.  Any new pages created will automatically get the module -- if you don't want it on a new page just delete it.   For the second claim -- do the same.  Select "add to all pages" and go through and remove it from all pages where it should not be (tedious if you have a lot of pages).  Once done, though, it's simple to pick which text module to delete as you create a new page (hey -- you probably will have to manually do something to determine that for new pages no matter what you do).

A Better Way -- Part Deux
This is what I would do:  Create a duplicate version of the skin file you are currently using.  Drop it in the same skin folder next to your original file but append the name with "_claim1" or something.  Create a second duplicate and append the name with "_claim2".  Add your respective claims' HTML code directly to the new skin files.  Make "claim1" your default (for those 90% of pages).  For the other 10%, of pages that use claim #2, just go into page SETTINGS and change the skin from the "_claim1" skin to the "_claim2" skin.
 
EDIT:  This is all assuming your "claims" verbage is not likely to change very often, that it won't require localization and that you will not be swapping to a new skin anytime soon.

-mamlin