I agree that the K10D is a tough jump. I'm still teaching my sister about photography on an Superzoom P&S with manual controls.
K10D requires a lot more input to get the picture right. However, if you must require a set it and forget it setting. I would recommend these changes:
> 100-400 auto iso, 400 is all you'll need outdoors, especially being paired with a f/2.8 lens, the noise jump to 640 in the off chance it needs to be used isn't worth it.
> +0.3EV or +0.7EV, while it's great you like doing post processing, the less you have to do the better. Shadow detail is more important than highlight detail imo. The K10D tends to underexpose anyways.
> -1.0FEV. You're using it as a fill flash, -0.5 is still too powerful.
> I would consider skipping the diffusor. Diffusor + HSS + outdoor = a lot of flash power. Results in shorter battery life, longer recharge, etc.
> Play with the jpg processing to bump up the settings to ATLEAST brightness (+2), contrast (+2), and sharpness (+1). Unless they are a true photo critic, I find people generally like punchy images, not detailed images. They've been brain washed by the Canon Nikon out of the box settings
Since you're doing RAW + jpg anyways, your friend will appreciate the immediate presentable pictures while you work on the RAW image for the good stuff.