I use IBL with IDL at times. I don't see a special reason not to. Bagginsbill released some IBL lights with an old version of VSS and I still use them (at lower intensities). Nicest lights I've ever used. If there's a good reason not to use them, I'd be interested in hearing it.

However, I don't think I've made a render without IDL since I upgraded to a 64 bit version of Poser.

I use a dome with scenes involving lots of props. Provides a nice sky and relfections for outdoors. I almost never use the lights that come with a prop/figure scene unless they are point or spot lights that refer to actual props, such as lamps, in the scene. So whether the included light sets work or not isn't an issue. Most vendors' lights are not appropriate. Some are still releasing light sets with depth map shadows or 20 ambient lights to simulate IDL.

For indoor scenes that aren't enclosed within their own prop (like corner of a room rather than a whole room), I render within a sphere that has a texture appropriate for indoors.

If the sphere isn't big enough for a huge outdoor scene, I scale it up.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.