The last version of Blender 3D API come with many features and option to solve your issues.
Too many for a normal user.
For example: if you want to add some images into SEQUENCE_EDITOR this will help you.
From starting you need to know the last API and this may not be the last option.
The BlendDataImages(bpy_struct) - version 2.79 and can be used.
Another option is this function on the version 2.78 the scene.sequence_editor.sequences.new_image.
The good way is to have a good area of examples and tutorials into documentation.
This will solve many post on Blender 3D community area.
What I want to say is the desire of the developers to manifest themselves and not to maintain the user learning process.
Most API learners do not have the same speed of processing and learning as developers, especially if there are multiple and frequent changes.
