I somewhat agree with this, and in other ways disagree. We all don't like being restricted, but Simon is right, due to people not understanding the rule not to flame new users, no matter what the element is.
For example, a new person suggests Peanut Butter. Countless members will flame the idea of its stupidity. This is what should be avoided.
Another point too, is that it's not up to users to decide what goes into TPT. Posting whether you like or dislike the suggestion probably will not affect it's possibility to being put in the Official version much at all. It's really to the people with the titles of Moderator, Developer and Admin.
However, I see good in that people should post saying that they add it to their mod and recommending it to *Simon/a Dev which may help the possibility of it being put into the Official Version.
My suggestion would be for mods to check/uncheck whether a user may have the privilege to post in a thread pertaining to Element Suggestions. But then again, it's just a suggestion.