[DVD-o-matic] Multi-reel DCPs w/DVD-o-matic?

Hello everyone, I have created four 24- to 32-minute long DCP packages for a friend and hobby filmmaker who is going to screen them at a local movie festival. Now, I've heard back from their technical department that the DCPs I made using DVD-o-matic are single-reel and that "might cause problems", whatever that means. As far as I understand it, there is a convention to limit reels to somewhere around 22 minutes (e.g. typical old "analog" reel size) to minimize problems in transfer and handling and to keep the sizes of the files in the DCPs reasonable. But I wouldn't have thought that a 32-minute single-reel DCP might be problematic. Can anyone enlighten me on the subject? I'm no projectionist or TMS technician (I'm helping my friend because I have maginally more hobby experience creating DCPs than him), so there's a huge question mark hanging above my head. :-) Furthermore, is there any possibility to create multi-reel DCP packages via DCP-o-matic, or to convert the single-reel packages into multi-reel using open-source tools? Thanks for any help in this matter Kasi Mir