Having used both the iOS and Android versions of B4x I believe there is a common area in both that could be improved.
When an object is defined in B4x the hint tips that appear when typing the object name are excellent in illustrating the properties and methods associated with that object. However, the events that are available by association with objects are not always so obvious. There does not seem to be a single source of reference that details the events that might be available with a particular object, we currently rely on samples of code provided here that (hopefully) illustrate the common possibilities to solve a coding problem.
VB6 has the two drop-down boxes that will give a clue to the events available from a particular object. Maybe some form of in-IDE object reference is the way ahead for B4x ???