Does Backendless support the "delay_while_idle" flag in GCM?

I was wondering if this feature is implemnted in Backendless’ services or enabled by default / can be enabled:
https://developers.google.com/cloud-messaging/concept-options#ttl

Hello Minitour,
Backendless does not support the “delay_while_idle” flag in GCM. If you need this for your application please contact sales@backendless.com so that you can discuss the conditions under what it may be implemented.
Artur.