I agree that the policy on links and product mentions should be lifted to a certain extent.
For example: I recently switched from an email based support system to a ticket system in my online shop. So I asked others for advice and we discussed different ticket systems and other shop owners pointed me to ticket systems they had tested and so on. A really valuable discussion.
Only: It did NOT take place here on webmasterworld but in another forum. Actually I did not see any use in opening a discussion here when you then get answers like this:
"I know a product that might suit your needs. It has this and this and this feature, just google for "w i d g e t" it's the fourth search result from above."
If you want to prevent heavy promotion then allow URLs only for users with a post count > 50.
Also: I don't see webmasterworld having problems with the guys from Google promoting here as Google Guy or Adwords Advisor or Adsense Advisor.
Usually you can easily detect when someone is only promoting his product. If I open a discussion about Help Desk Software and suddenly someone with a post count of 1 pops in and tells me "Product XY is great" I know what to think about it.