Dual Mass Flywheels absorb the harmonic torsional vibration caused by low rpm in few cylinder engines ie 4 cyl at under 1500 rpm, worst under load. That is when the DMF will be working and wearing most and at a time that you can reduce wear, but low rpm is where the economy is and this is why the DMF is used, to take advantage of the low rpm economy without the shudder or chatter (petrol motors have the harmonic vibration also) most v8s are smooth right from the idle petrol or diesel it is the length of the crank coupled to the amount of cyls.
Nailing it at the lights and walking off the clutch has to work it hard, also burnouts with axle tramp, I think would top the list for life reduction in the DMF.
Best mileage from the DMF will be achieved while in top gear cruising over 1500rpm. If you are in town, you are in town, maybe use 1 gear lower during low RPM and less peddle at low RPM being the only things I can suggest, it may be better for you to consider auto. These diesels are good, add up the $ in fuel saving for 1 year.
I have a pig 307 with the 6sp, I run start it regularly, I have done 200k+ and the DMF is buggered (clangs at the idle and shudders during take of) but I am still driving. Towing with the 307 is good, pulls like a train. I am told? that the starter drives to the trany end of the DMF, if so starting alone will work the DMF.
LuK have a good article on DMF.
youtube. LuK Dual-Mass Flywheel - design and function.
On torsional vibration have a look at this and imagine it to be your crankshaft.
youtube. Torsional Vibration
Also I watched a good article on fluid harmonic balancers (HB), same deal but at the front of the crank.
The effect is like an impact wrench driving your car, the vibrational torque peaks are high and are hard on the trany and the crank. Smoothing this is the job of the DMF and HB. In a non DMF 4 cyl vehicle, you will know when these forces are active as the vibration comes through the whole vehicle even a 6cyl truck, but I have used vehicles for long durations while under severe torsional vibration and have never had a broken crank or trany as a result, it was the shudder that is most irritating and what often forces one to down change a gear.
I say "she'll be right" and "don't you worry about that" well too much anyway.