How to help the staff be happy

After lots of experimentation in sandbox mode I think that I can say this:

• Every building part and scenery object has a scene value and an effect radius. These values can be vastly different, but do not necessarily correlate with price or size.
• Each of these objects affects all queue tiles within its radius. The total scenery value of each queue tile is the sum of the objects which affect it.
• Effect radius is limited horizontally but not vertically. That means scenery can be placed far above or below the queue and still affect it fully.
• The scene rating of a ride is the average of all tiles of its queue.

That means in effect:

• Rides with short queues are easier to style than rides with long queues
• Compact and winding queues gain more score from each tile than long, stretched ones.
• Placing scenery very close to the queue is good for two reasons. First, more scenery objects can affect the queue and second, each object will affect more queue tiles.
• When you don't care at all about aesthetics or realism, you can move all the scenery exactly below the queues and a hundred meter below ground.

Update Version 1.1.3: While the patchlog says that "Various improvements have been made to how guests assess ride queues", none of these seem to have invalidated any of the above points.

You can only duplicate multiple scenery objects when they are part of a building. While you edit a building, you can select multiple objects by holding ctrl or the multi-select tool. You can then duplicate them all at once. If you don't want the scenery to be associated with a building, there is a trick:

1. Place a single wall to start with a new building
2. Place the scenery objects using duplication as you need
3. When you re finished, select all the scenery objects and click on "separate from building"
4. Delete the original wall