Angry [Q] Sync Mail: sync intervals for pure Google Devices

I am writing to share with you for an application that I developed to make up for a lack of terminals with Android version "pure Google", in particular, the Nexus 5.
About a year ago I purchased this terminal and, having examined in detail, I am extremely happy with this purchase
Compared to my old Samsung S3 I found only one small flaw: in the application that manages the email there is no option to set the synchronization intervals.

What does that mean? I receive emails outside office working hours and during the ****ing terrible!
So I decided to develop an app that would allow me to bring this feature on my favorite mobile without having to root.
a few days ago I released a version (free) preliminary application on Play Store and I'd appreciate that you tried and you made me know your impressions and suggestions.

You could try it on your device to see if it works?

Sorry I cannot publish the link directly cause to spam directive.
In Play Store search for Intesys and "Mail Sync" (it.intesys.syncmail)

Thank you for your help
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