Yes, FT Suggestions would be the right place to offer suggestions like this.

Personally for me, I would not use the links since I already have the appropriate airlines/hotel/car web sites bookmarked, and for most of them I know the URLs. But the suggestion is good nonetheless, especially if also it can be accompanied by an entry in the FAQ which asks users to use these links to access information which is readily available at those web sites. So for example instead of asking in FT what the blackout dates are for United airlines, use the link to obtain the information from the United web site.