The pickup position shifting can not be changed.
Can you add this function?

I can add this to the feature request but I can't imagine a scenario where this feature could be useful if not to add it because bob has it.

I may not have expressed my meaning clearly. It is the pickup offset position just like the drop offset position. and bob does not has it too.
I know this feature is not very needed. This can only increase inserter max speed from 15 to 30 times pre second if the pickup position and drop position in the special position. Perhaps most people useing this mod do not knew the inserters max speed can reach 15 or 30 times pre second.

OK I understand
I did a rapid implementation of that feature
https://imgur.com/a/XDr6JVV

Thank you very much. I think the function of this mod is perfect.
And I will add This mod in my linked chest mod optional dependencies

Feature doesn't work for me. (see my thread)