Now, I wrote this and photographed this using my MFT-1080. I believe the same process will net you more space on your MFT/3, but you'll need to read this and see if your rail fence clamp will allow it. Please post your results in the comments...
The Festool MFT-1080 table is genius, but it also has a hair over 24" cross-cut capacity. For whatever reason, my recent projects have all had big panels or drawer front panels that easily exceeded this limit. Granted, Qwas dogs and rail dogs will get the job done a different way, but it isn't the same. It just isn't.
I honestly never use the miter gauge on the table. A bit awkward and usually I do those cuts on the table saw or, if the panel is big, I draw the line and put the guide on it. If it's 45°, 30°, or 60°... I use the Qwas dogs.
I squeeze the fence to the alignment bar (a 30mm wide bar of MDF) and tighten the clamps. It holds surprisingly well even when I banged a huge panel against it a few times to see if I could misalign the fence. The one minor complaint I have is that tightening both clamps up slightly lifted the front of the fence. I may tinker with a spacing washer in the rail fence clamps to avoid this.
I left the alignment bar there, dropped the flag stop and made a cut to eventually scoot the fence over so the flag stop's position on my metric/imperial tape was dead on.
Tonight, I was crosscutting a large panel that will become the stock for drawer fronts of a built-in I'm making. It was 27.5" wide and cleanly fit on the table. Voilà, my new crosscut capacity.