Definitely!!! don't use the handbrake when stopped while its in any driving modes (R,D,S,M). The foot brake has been designed that when it is pushed it disengages the accelerator (and thus the clutches) but when you use the handbrake it doesn't and as a result it will slip the clutch for the entire time you have the brake on which makes them red hot and wears them out real quick.
This is the reason the electronic parking brake and auto hold features has now been implemented on new models - so people can't use the handbrake while its in a driving mode but they can take there foot off the brake with the auto hold feature.
When you are coasting or rolling down a hill you will see that the revs will go up and down. This is the gearbox clutches attempting to engage on a hill to apply engine breaking but because its not pulling the car down the hill (gravity is) it won't damage the clutches excessively. Yes any slipping of the clutch will wear it down and create heat but its the difference between the small force of engaging while rolling downhill or the clutch slipping heaps to pull a 1-2ton car up a hill.
This is where peek hour traffic kills these gearboxes :( sometimes its unavoidable to slip the clutches in traffic but the best practice I try to follow is don't move up unless there is at least 1-2 car spots in front of you. This gives the clutch time to engage fully. The other thing is don't take your foot off the brake, and give it no accelerator. This form of creaping is the worst for the clutches - especially up hills!
Remember this only really applies to the 7sp dry clutch. The 6sp wet clutch you can slip a lot more without a hickup becuase it has a mulitplate clutch (more durable and can take more force than a solid plate clutch) and the clutch is bathed in oil to keep them cool.
This should really be explained when the sales people are selling the cars. Horses for courses!