How do you deal damage to your opponent's nexus in Dominion?

I know that you damage the opponent's nexus by controlling more capture points than they do. And I think I recall from the one game I played last night that there were other actions that did this as well, like killing enemy champions.

I'm also curious about the rate at which nexus health decreases when you control 3, 4 and 5 bases.

What are all the ways to damage the opposing team's nexus, and how much damage do each of these actions deal?

From what I have read and played, the following actions decrease nexus health :

• Controlling more capture points than opponents decreases Nexus life over time (x damage per 5 seconds for each point you control IF you control more points then enemies)
• Killing an Enemy champion deals immediate damage (-2 life to nexus if nexus life is above 100)
• Achieving a secondary objective (quest) deals immediate damage (-20 life to nexus) and gives your team a buff (like Nashor in normal mode, except not the same buff). Those secondary quests appear randomly and consist of capturing a specific capture point. These quest spawn for both teams at the same time and always concern two Capture points next to another.
• Point Neutralization and point capture (-3 and -2 life to nexus if nexus life is above 100)

The following actions always apply:

• Holding the majority of capture points: X Damage per tick, where X is the number of capture points you control. ^{_{(regardless of how many capture points are owned or neutral.)}}
• Completing a quest: 20 Damage

The following only deal damage if the opponent's nexus is at or above 100 health:

• Killing an Enemy champion: 2 Damage
• Point Neutralization: 3 Damage
• Point Capture: 2 Damage