BIS_fnc_attachToRelative is a super useful tool for attaching things with WYSIWYG placement in the editor, rather than having to manually fine-tune offset and setDir etc. But there are two things it can't do that regular attachTo can: attaching things to memPoints, and then using the new followBoneRotation argument (added in 2.02) to apply rotational attachment.

Adding these new capabilities to BIS_fnc_attachToRelative would make the function into the dream tool for attaching things to other things in Arma.

Proposed syntax:

[object1, object2, visual, memPoint, followBoneRotation] call BIS_fnc_attachToRelative