I tried the new unit and used the skill with timebomb but I have to say that it's a little bit lackluster. I had difficulties to even get it triggered. It has a delay of 4 rounds. Most of the fights are over after this and normally you kill the enemies one by one because a enemy with a sliver of life does full damage. So no enemy lives for 4 rounds if you started attacking him. I haven't seen damage numbers so I guess it destroys the target after it triggers so maybe it's Good against bigger ships but I have to try it out or ships with high healing.
Edit: no you can't get timebomb on a leader ship.
Maybe it would be better it get triggered if the ship is hit again by the same unit. Maybe others have better ideas or I'm seeing it all wrong