My own Quest starts, like many, by a note delivered by the courier. I use the default courier and just added the note to his container in WICourierCell and then added the condition to his list in the dialoge I want to use. But if I leave it like that, other mods may overwrite it or my mod conflicts with others.

http://i.stack.imgur.com/Lasl1.png

What is the safest way to make use of a courier without conflicting with other mods?

Can I just duplicate the one in WICourierCell and use it and what do I need to remove to make the copied Courier look for the player only when he has my Quest?
Or can I add the needed condition (as shown on screenshot) dynamically somehow so it does not interfere with other mods?

edit: Oops can someone move it please?

Follow this tutorial - It's (probably) other-mod friendly

http://www.youtu.be/iustaHoHnEE?hd=1

Yeah I did it this way. But what if another mod edits the same topic and adds their own condition?
Does the Engine merge that properly?

edit:
I just tested it, it is not other mod friendly.
Puh, so I got to recreate all that? -.-^^
When I copy the WICourier Quest it does not take over the dialogue.. that's gonna be fun recreating that.

If you want to be 100% other-mod friendly (and who doesn't, but almost all of us aren't) then you could create your own courier (with it's own quest and scripts)

The system is not too hard, really ... Someone has a script posted on here (somewhere) that dealt with "custom couriers" and the scripting involved

Other than that, you are correct that if you use the vanilla courier system there is a chance that some other mod will do the same and neither or either will/won't work

So you'll have to decide whether you want to be 100% other mod friendly, or whether you put a disclaimer in your mod to say "any other mods you have loaded that utilise the courier system may break - or break this mod"