You can set a default value on search-help fields, but these are set as EQ values. If you like to set default with other operation like LE, GE etc then you would have to implement search help exit and write code there.
There are two kinds of Infotypes in SAP HR. Personal Administration Infotypes also referred as PA Infotypes and Organisational Management Infotypes also referred sometimes as OM Infotypes. Here is comparison of these two Infotypes
Context menu is powerful tool to provide quick and context specific options to users. SAP Module pool (classical Dynpro) does support context menus and in this blog I will explain how it works with a sample ABAP program.
If you create ALV Grid report using class CL_GUI_ALV_GRID then you may like to read this blog to avoid scroll bar and unused screen space issue.
To put it straight and simple, collapsible area is not a predefined screen element or GUI control but it is technique of putting multiple screens in right sequence.