heard a lil thing about applying ALL rank points to energy and at some point (this is what interest me, amount?) you can pretty much climb ranks as long as you wanna sit there clicking missions.

who has done it?

I don't remember the thread but I think with no RSL you need around 25 rank points per rank put into engineers to rank from the high return missions alone. Doable but not easy since energy modules also factor into it until you run out of those where prisoners might keep up. The higher xp/energy ratio of NPC farming lowers the limit to something much more attainable for the majority of people.

I seem to remember the math was 14 rank points for NPC with RSL.

You can't get 16k npc attack by investing all your rank points into energy though. You max out somewhere between 6 and 9k npc attack i think without tac officers.

When combining tac officers and engineers the correct formula to auto level off npcs depends significantly on the common npcs that are allowed to spawn on your battle tab. There are rank ranges that can easily get 5 or 6x energy to exp return and ranges that are lucky to get 2.5x (such as right after rank 350 usually).

Also, at my 13k attack and over 10 times my rank in energy I still can't auto level off npcs without an RSL. Testing with drannick sabs suggests that an extra 500 points in engineers would get me there faster than 500 more points in tac officers. Though the damage cap goes up faster than health on matched npcs so your xp return gets better the higher your rank if you keep up with the cap.

be happy Dan didn't put a cap on how much energy is refilled

We've considered it...

We've considered it...