[SLOWn60]

When dirt biking in hilly terrain you will soon learn how useless the front brake is if rolling backwards down a hill! Using engine braking by feathering the clutch whether the engine is running or not will give you full control and stop the bike from rolling backwards out of your control.
There are different scenarios of braking/clutching depending if your pointing uphill or downhill but if you practice on the flat or a very gentle slope I'm sure you'll quickly catch on.
As for worrying about holding up traffic because you have to get off the bike: I wouldn't waste one second worrying about it! Do what you have to do and do it in control without adding needless pressure to yourself! Be more concerned that when you do get the bike parked; it's at a safe angle so it won't tip over and in gear so it won't roll!