This is not an answer.
I have create a CUSTOM LIST with some simple fields. If i want to import the template in a new installed Sharepoint Foundation 2010 it WORKS!!!!!.
What feature is this that you describe that have my local sharepoint foundation install (and does note contain in Sharepoint online ?
I have to notice that the list template have been exported from Sharepoint Server 2010 (and it works an a clean installation of Sharepoint foundation)
And please next time have a documented reply , you are MSFT and you must show more responsibility and accuracy on your answers.