APP has exposed a number of PDFlib features since it's addition for Version 11, e.g. taggedPDF, annotations, layers, XMP etc...
There are more useful features within PDFlib v8 and 9 (soon in APP) that many customers we know would benifit from, but have not yet been exposed to the user API. Initialy this includes the Form Fields options to produce Mouse over tool tips. As it is already under the surface in PDFlib just inaccessable, I propose this and other voted PDFlib features could be exposed to the FOM API, just as Notes and Layers have in M040.
See 'Form Fields / Text Field' in PDFlib API docs.