With some Tagadelic related module you can Suggest Tags
Would it be possible to add a kind of suggestion for tags to add to content? Yes
In fact with the Drupal Commons included contributed modules:
1. Tagging.module you have
A. Tagging extractor suggestions
B. Tagging full-vocabular suggestion
and if you add the Drupal.org to the Drupal Commons ./profiles/drupal_commons/modules/contrib folder or ./sites/all/modules Folder
Activate the new module and You will achieve the wanted result:



Comments
Response to myself
Well I have not to forget to search for module on Drupal.org.
In fact with:
1. Tagadelic
2. Tagging extractor suggestions
3. Tagging full-vocabular suggestion
and
4. Extractor
You, in this case me achieved the wanted result.
Which one,
would you suggest?
Hope now this is more clear for you
Hi @Juan, I have modified the original post so it is a bit more clear also for others. ;-)
Just to be clear,
you are suggesting that one would need to install all four modules, for someone to achieve the aforementioned.
Sorry Juan, I just realize
Sorry Juan, I just realize that you are right. I did review again the original post. Hopefully is more clear now.
No only Extractor module is additionally needed. Thanks for headup. ;-)
Crystal clear..
Thanks. Nice picture, it really puts things into perspective. It makes one, want to want it :)