Activity diagram fork to be styled as diamond (BPMN flavour)

Question

Can fork be represented by a diamond instead of a bar? Same way as it is implemented with "end merge".
If yes, then it would be perfect to have an opportunity to "style" both the start and end diamonds with a single character inside the diamond e.g. "+", "×", "○".

This MAY be valuable for representing BPMN diagrams using PlantUML activity diagrams and shall introduce more conformity to BPMN specifications.

Answer 1

@startuml
start

:Action 1;

if (Fork?) then (yes)
    :Action 2;
    :Action 3;
else (no)
    :Action 4;
endif

:Action 5;

stop
@enduml