Started Hours format

Sorry, but it's me again ;-) 

Currently there are two hours format:

Short (1,5 h)
Long (1 hours 30 Minutes)

My colleagues are asking for a third one:
Medium (1:30 h)

People do not like decimal minutes and the long on is very disturbing on calendar overview.

Kind regards,

Started integration with Knowledge Base

Would we really nice to have a integration with in Knowledge base. Including storing the drawing as file. Similar to this plugin: