Samsung doesn't have pocket mode but they have Accidental Touch which is similar which might help some.
I suggest a couple of other things as well for pocket carry.
Carry the phone screen out. This may sound counterintuitive however the problem with pocket carry is the inside material is usually thin and any kind of perspirations can translate the skin on your leg into what a device would consider a touch. This will keep the phone awake and if unprotected open apps, change settings and drain the battery.
Carry charging and headphone jack port down. Gravity will help keep them clear.
Use a security screen lock. This will typically stop the random events you've described, apps opening, settings changing and minimize battery draining when used in conjunction with the others allows the screen to time out.
It takes some getting used to but the benefits outweigh the learning curve.
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