No, they are not the same Look angle in “Define Sensor Geometries” defines the sensor field of view capabilities Look angle in “Define Sensor Constraints” allows to optionally  limit the operational steering looking angles within a minimum and /or a maximum

This is used when doing coarse planning of acquisitions to provide convenient tolerance and avoid clipping an acquisitions because timing was not sufficiently accurate. We usually applied one or two second lead and trail times in ESA’s Envisat mission planning

Follow this explanation http://1.help.taitussoftware.com/SaVoir/help/content/6.advanced/constraints/gap/gap.htm

This is explained here  http://1.help.taitussoftware.com/SaVoir/help/content/6.advanced/constraints/exclusivegrouping/exclusivegrouping.htm

See a deeper explanation here http://1.help.taitussoftware.com/SaVoir/help/content/6.advanced/constraints/duration/duration.htm

The cloud figure is a qualifier parameter, just that. The acquisition will not be planed if you have configured the sensor with a Cloud Constraint and the cloud figure is out of the defined bounds See more here: http://1.help.taitussoftware.com/SaVoir/help/content/6.advanced/constraints/clouds/clouds.htm

It has nothing to do with stereo or non stereo. Usually you leave it to zero. It allows defining sensor geometries with a certain pitch inclination, forward ot backwards.

It is usually applied to SAR sensors, whereby the satellite may have two looking sides right or left. We use the slew qualifier to allow using the same geometry figures for left or right, therefore reducing the risk of configuration errors. For optical satellites you usually consider SLew = Not applicable