Hello,
To search for one character you need to include an asterisk 'a*'. You can do this also programmatically.
This could be done with an custom web part which would change the banner according to it's location. There are also some banner modules in our market place available like
this one .
We don't have an Editable pdf control, module or web part. So I am not sure, what do you mean by this question.
For the additional features on the document library you will have to modify the given web part. The document library can be found in CMSModules\DocumentLibrary\Controls\
DocumentLibrary.ascx and it uses a
UniGrid control. Please check the UniGrid definition and setup properties so you get more familiar with the concept. You can find the documentation
here.
Best regards,
Boris Pocatko