Is there a way to use other lock-screens on the htc sensation then the one that is provided by htc sense without installing a custom rom? (rooting is fine) I would love to use the standard android lock-screens, is that possible? (I don't care if it is achieved with an app or by modifying the settings)
There are some "lock screens" like Go Locker, but they are not "real" lock screens. Lock screens are just about the only part of the android OS that cannot be replaced by 3rd party applications. These other lock screens attempt to override the real lock screen. Some of them work fairly well, but I always notice some type of lag when turning on the device or unlocking the device.