First of all, the first three scenarios are working NOT because of BRF+ but because the activation step actually distributes data. Try removing the distribution step and you will see that the record is still being distributed. Now, to be able to control the distribution via BRF+ only, you can create a sub-object in transaction SWO1 for object BUS2250. In this sub-object, redefine method ACTIVATE_2 to always set the value of NO_DISTRIBUTE to 'X'. This means that no distribution will be done automatically upon activation. Keep in mind that redefining methods in SWO1 means that you need to add the same logic in the original method in addition to making the changes you need. In case of method ACTIVATE_2, you need to remove this statement:
swc_get_element 'NO_DISTRIBUTE' no_distribute.
Instead, add this statement:
no_distribute = 'X'.
Everything else should be pretty much the same. You will need to define a new variable that replaces the object-private-mo_service variable because it is not going to visible in the BOR sub-object. See how object-private-mo_service is defined in the original program and just define the new variable in the sub-object.