I can't help with a Jowan mod, but you can already "Have your Alistair, and Defeat the Blight too!"
No mod needed, but you do have to enable the Command Console. Send me a PM if you're interested and I'll point you to the Spoiler thread where this is discussed in detail.
[Edit: Or see my post about six above yours, where I refer to it a little more specifically.
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Thanks for your reply, Thandal. Unfortunately, I dont even know what this "Command Console" is :S Is it easy enough to work for somone who is pc-retarded?
The "Developer Console" is a built-in command-line interface for the game. You can use it to execute "commands" (scripts) that the BioWare team placed into the game to let them test things in a hurry.
For how to use it, see here:
"DA Wiki - Command Console ".
If you're really new to using this kind of feature in a PC game, you'll probably want this mod as well:
"Make Console Commands Visible". Otherwise, you won't be able to see what you're entering.
Oh, and back to your original issue:
1. Be sure to leave Alistair to guard the gates before you head into Denerim itself.
2. The command you'll enter at the appropriate moment on the rooftop of Ft. Drakon is: "runscript zz_addparty Loghain".
I assume you realize what will happen from there...
Edited by Thandal, 11 February 2011 - 02:42 PM.
fixed typos.