I am new to affiliate marketing, and am setting up an affiliate program on my website. I plan to install iDev on our server, and was curious how important the affiliates here think the iDev "Custom Filename" Addon is?

Also, any comments on the rest of the addons would be appreciated. Here is a list:

Custom Filename
Private Signup
SEO Links
Language Packs
QR Codes
Vanity Coupon Codes

I heard the SEO Links addon is not advisable. And does anyone even care about QR codes?