2- Can I set the speed, that is a faster movement, in automatic mode (I mean automatic movement, when programming a sequence in shoot-move-shoot)?
from what I know you can't change speed for now in MX2 ! Merlin control from MX2 is pretty basic for now !
3- How to program the Merlin for a spherical Panorama? I mean:
- 1 shot for the Zenith + 6 shots around + 2 shots for the Nadir
not possible for now with only the MX2 ! For that, you would need to use MX2 normally and control Merlin with Papywizard or other solutions and start pano shooting at each stop (you can setup the MX2 so it stops and waits at each position, so you have time to shoot the pano !)
4- Also is it possible to program the MX2 for a gigapixel panorama like 50x20 shots. Any hint on how to do it?
For info, MX2 firmware is open source so if you have programming knowledge or know someone able to, you can modify firmware to add additional features in it
My shop for panoramic photographs: http://magasin.skivr.com
Nodal Ninja 4 R-D16 on Benro Tripod + Ultimate R1 on Nodal Ninja P2 + Nikon D800 + Nikkor 10.5 + Nikkor 14/24 f/2.8 +Pentax 645D