Hey!
Instead of using a TriPod (or GigaPan) just hold a normal cam in your hands and move it around you an take lots of shots (do HDRs!) with a stretched arm. Don?t forget to have enough overlap (2/3) and to take some photos of the point you were standing at. After photo-alignment PhotoScan will generate a 3D-Model. It even works if you move your cam a short way like a stretched arm in this example. With the 3D-Modelling-Software of your choice (I use ZBrush) you?ve to build insert a (mostly half-) sphere around the place you?re standing and scale it up to fake the background. Don?t forget to flip the normals of the sphere. With some modelling skills you can sculpt between spaces which weren?t calculated by PhotoScan. Reload the finished model into PhotoScan and generate the texture. In most cases it looks better than Modos HDREs ( example:
http://www.luxology.com/store/kits/hdre/moofe/ ). And with floating-point images (HDRs) you can use that as a light-source too.
Greetings
tezen