Fusion is based on a version of Make (make.com)Have a look - these API calls work: https://www.make.com/en/api-documentation/api-structure

It's a pain to check whether someone already started a discussion or submitted an idea.There is no way to search *within* Ideas or Discussions. Can you please add this (would reduce duplicates/noise!)

emails are unique acorss the systems whereas $$USER.name may not be.  Also, since name may include umlauts/accents that variable is not ideal.  I want to filter (report/view) based on the current user's email address because on our case the address is stored in custom field when we don't find the us...

Not possible as a direct integration (Smartsheet blocks Fusion calls at IP range level i think) Only via an intermediary (ie, Fusion writes to GDrive or Sharepoint, Smartsheet pulls from there)