Key points here.
DONT EVER JUST DIVE IN AND MESS WITH THE CABLE!
There, got that off my chest, much better.
Auto users, handbrakes need to be used even if you do have a (flimsy) parking pawl in the auto box. Use it or loose it (well watch it seize up and fail!)
To do ANY handbrake correctly, you must service the rear brake setup, this is true of ANY make of car. This needs to be done with a slack cable and the mechanism cleaned and setup on the rear hubs correctly.
Only then can you adjust the handbrake cable and note, 5-6 clicks is about right for an Omega handbrake.
Because the Omega handbrake operates via a dedicated set of shoes, its worth applying it lightly for 100m or so every month or 2 just to keep the inner drum surface nice and clean.
Follow the maintenance guide and you wotn go far wrong.
As for needing to heat the handbrake rod....a good squirt of a good penetrating fluid (and noteWD40 is NOT a good penetrating fluid) will sort....I am yet to find one (and I have done FAR to many) that is truely seized.