How do I tell Activity-beta to start drawing from the top of the swimlane?

Question

There might be good reasons for it, however in some cases it's nicer if we can have more control about the placement of sub-activities, i.e. activities within a swimlane.

For example, the following diagram is very "high", I'd like to tell PlantUML that it should start new activities in a swim lane from the top.

@startuml

|QA|

start

:Finds issue
(Bug or Missing feature);

if (BDD needs to be updated?) then (yes)
    :Update BDD scenario;
else
endif

|Developer|

if (Unit tests accounts for issue?) then (no)
    :Add Unit test;
else
endif

repeat
    :Modify code;
    :Execute BDD and Unit tests;
repeat while (test fail?)

:Push code changes to Git;

|Jenkins|
:Start Continuous Integration;

if (All test pass?) then (yes)
else
    :Raise Issue;
    stop
endif

:Create Packages;
:Push to Package Repository;

end
@enduml