You should add a feature where you can copy certain events, and when you go to another brick that has existing different events, it just adds the copied events right below it, without deleting the original 2nd brick's events.
Edit: For example:
brick 1 has: onactivate>self>setcolor>pink
brick 2 has: onactivate>self>setcolorfx>glow
and I copy the event line from brick 1, and open the events on brick 2, brick 2 should look like this:
0. onactivate>self>setcolor>pink
1. onactivate>self>setcolorfx>glow
thus the final outcome of brick 2 once activated should be pink and glow