Recent versions of acd_cli have largely fixed all the issues I've had in the past. I've found that essentially all issues can be solved by not writing directly to the cloud drive, but using a unionfs and uploading on a cron job.
There is no 2gb limit that I have run into. I just checked and I have several >30GB videos uploaded to my cloud drive, so I can safely say there is no issue there.
Edit: For some completeness, here's how I have everything mounted and syncing.
Whoops. The truth is I have 2 cron jobs, one running on the hour to upload TV, and another 30 after to upload movies. I meant to simplify it to just syncing the entire thing for the post, but I neglected to do that properly.
I have not looked into only mounting a section of it.
Former Cloud-Driver here. We launched a significant upgrade to the back-end just before I left, which technically speaking does not have the 2GB limit. That being said, I don't know if there aren't any artificial constraints. I was just responsible for the bits :D
Thanks for the reply. I use Cloud Drive more for archival purposes than anything else and up to this point I have been RARing my files into 1.5GB chunks.