We are working on the currency document to ensure that it is more complete and directs you to all instances. What pages do you have with the $ still on them? I can give you pointers on where to make the updates for these.
As for the newly updated PS files when you add them to your site it will undo any customizations that you have made, so you would need to go back and make these updates for the currency again after loading the new files.
I understand how inconvenient this is for our international users so I have ensured that a feature request has been filed for PowerStore, the request asks to have this functionality present in the admin settings for the store so that it can be updated once for the entire store. I do not have any ETA on this update though.
