You never will do anything that the machine can't handle (as long as you can chuck it you can make it). You just have to be a bit creative when doing things, AKA Think outside the box...

For -X- live tools I use Colleted extensions... These are .625 shanks to an ER25. It's not the most rigid way, but it works quite well. I also manipulate the sub jaws as much as possible, to allow more clearance to the turret. In some cases, I used a -Z- live tool and G12.1 to create squares, hexes and other odd shapes, instead of using an -X- Live Tool and buzzing across in -Y-...

If you ever run into an instance where you can't use -Y- to go all the way across the part, you could either use X index and X again (if you have a thru hole) or you can use G12.1 and use C (or A) as a -Y- Axis...

If you need more tool length with a -Z- live tool, Eppinger sells offset tools to allow this to happen... http://www.exsys-tool.com/catalogs.html#CAT6 <- there you will find a Doosan catalog...

Remember a Multi-Task (or Multi-Axis) machine means being creative!