Thanks for your tests!
Obviously, we did not make enough of them.
Anyway, here is a last beta https://www.dropbox.com/s/koo42q3d9gxw288/plantuml.jar?dl=0
It supports:
@startuml
concise "LR" as LR
concise "ST" as ST
LR is AtPlace #blue
ST is AtLoad #gray
@LR
0 is Lowering
100 is Lowered #red
350 is Releasing
@ST
200 is Moving
@enduml
Do not hesitate to post again when you'll find other issues.
Thanks again