EuroAccord2.4AT

First, let I say I always drive with seatbelt on... I'm not one of those drivers who thinks it's cool to drive without one (you'll find out that you get real cool when you're involved in accident)

My reason for misleading the seatbelt is because I get pissed every time I get in the car, turn the engine on, and then put the safety belt on, the warning sound has gone off already. And I simply don't want to change my habit of doing it in this order just because of some electronic sensor says I have to change my habit. I want to keep my habit, it makes me happy.

Having said that, the solution is simply: just inplug the 'seatbelt-holder-thing' wire under your seat, you can see which wire goes to the 'seatbelt-holder-thing', there's a simply connector... just unplug it, 2 seconds of work.
The sound and the warning light think the seatbelt is on.