Selecting calendars for each tasks (Google Sync)

I use multiple calendars on Google Calendar for works and privates. Now I share a calendar for works with my colleagues. If I can choose choose calendars by each tasks, I can share my working tasks and schedules only.

Is there any plan to be able to select calendars to add each tasks?

Selecting function may be useful in another cases, like when you have several customers and want to share calendars to each ones.