Hide sidebar button in OpenERP
Go to the "Settings" module:

Open menu option Customization -> Low Level Objects -> Window Actions. 
Search for "SMS" in the Action Name and open it's form. 
In the "Security" tab you can set the groups that can view this action. Add the "Administrator / Configuration" group and it will be hidden to regular users.
I'm trying to write a module for OpenERP 6.1 that will hide the "Send an SMS" button on the Partner form. I tried overwriting the window action's id with a different name and src_model, but only the name change appeared. I traced through the code, and it looks like the ir_values records from the base module are still linking the action to the res.partner model.
Is there a legitimate way to hide a sidebar button, or am I going to have to modify the base module? I briefly tried restricting permissions on the wizard's table, but that didn't seem to have an effect.