You don't need to enter an approach or runway to generate TOC and TOD on any of the 737s I've flown including classics. I remember this because I like to go as high as possible with about 6-8 minutes in the cruise so i check the time at TOC and TOD while still on ground to determine how high to climb.
Unfortunately this doesn't work on my simulation, and it's the reason because I opened this thread.
Obviously it's a limitation of the simulated model, and I debated about this with the developers, but they argue that we need a point of arrival in the ROUTE or LEGS page, so then I took advantage of your expertise to find the best way to have a preventive T/D to do my calculations without having to wait for an approach clearance.
Thank you
Mauro