Well, for a good overview over the project the folders in the module list would be very important.
Here are 2 screenshots from the IDE. The module list is very large.
The duration of the compilation is similar to < v5. There I feel no difference. It's needed in my case in release mode 15-20 sec and in the debug mode 25-30 sec.
Maybe you can build in a optional hotkey, which opens your autocomplete function only with structures/classes. T.e. on Shift+Space or modify by user.
The reason is because I've many structures. And this would help too.
If you want I can send you my project, that you can make your own imaging. I think, in this case I can trust you. Maybe it's help to improve b4a more.
David