https://imgur.com/a/jFlRIIF

Would you please add AAI Programmable Vehicles Scanners / Controllers subgroup to the Circuit Group? That structures have signal input/output, they used more with circuit stuff.

This is already stated in FAQ:

Q: Why not this mod just set all the subgroups of all other circuit components mods?
A: It is because I feel it is not the best way to do that, and maybe a bit disrespectful to fellow modders. They may have their preferred way to handle things, like using further subgroups to show things nicely. Furthermore, setting subgroups of their items may actually disrupt and prevent fellow modders to work with this mod.
So I leave this mod purely as a common and basic framework for everyone. No code will be included to directly alter any modded items (not even those from my other circuit components mods!)
Still the best way is for fellow modders to add conditional assignments to their own items, who know their own mods the best.

This policy is the same as my another group mod Schall Transport Group. I am only responsible for the group, subgroups, and put ONLY vanilla items into them.

Is there any way to change groups manually?

What do you by "manually"?

If you are asking for the code to change group or subgroup, I already have the instructions written on FAQ page.

For example, maybe config options?

Yes, it is possible.
Yet it would be called "mod options", like the "Order of group tab" can be changed in this mod.
Also, this would need coding by other mod authors or yourself, but not by me.