There is Options / Options / Advanced Options: "Bring Dota 2 to front when pick phase begins".

Current behavior:
1. Game loaded.
2. Bringing Dota 2 to front.
3. Waiting for other players.

Suggested behavior:
1. Game loaded.
2. Waiting for other players.
3. If all players loaded and pick phase started - bring Dota 2 to front.