If you are still on older Lollipop or older Marshmallow ROM, you should definitely check out the latest Resurrection Remix ROM as it brings a ton of new features your Galaxy S5 needs.
Based on latest Android 6.0.1, the Resurrection Remix ROM gives you full fingerprint support. Not only that, it makes it better than stock TouchWiz since fingerprint works without having to turn the screen on. Simply swipe your finger and your phone will unlock, just like newer Nexus 6P or 5X. I find this alone worth installing the ROM.