Add Memory Processes and Memory Modules and Registry Keys and Registry Values and Registry Data and Folders and Files in Full System Scan
Considering that avast 8 has entered a closed beta phase, this topic is pretty moot, if it isn't already included in avast 8 then it is unlikely to get included in the first release regular of avast 8.
Not to mention many of the things that you ask for are already included in the current avast 7 version, Memory Processes and Memory Modules. Registry is only checked when a detection is made in the regular scan (looking for associated registry entry).
I have no idea what you mean by "Registry Data and Folders and Files" the registry is in itself a number of files (Hives), so it doesn't have files and folders contained within it only references to files and folders outside of it.