Particle collider(multi block structure) will include various pieces that affect effeciencey/yield/speed/danger, will also have some recasting effects if it blows up eg. Black hole, mutated mobs, Ect
See one of the Thread I've made in "Addon Discussion", which was supposed to be a list of suggestion for addons, but sadly ... I've been the only one to use my on list ^^. I've at the End detailed an interesting (to me) way of how it could works (numbers of block increasing the energy of what you can get, maybe with research system).
Multi people vehicles(may connect similarly to frames) eg. nether lava miner
Same things. (But I've suggested Vehicles more similar to Minecart, so just think about it for Oil usage etc ... in order to keep it balanced. Mines one also involved high Fuel consumption to encourage huge Multi-block structure for refining oil). If you decide to make an eletrical one, make it very expensive and amazingly energy-consuming ^^.
SPACE!!! I'm mostly keeping quiet on this one, hint, Multi people vehichles
Yeah. Keep in minds that RocketScience and Gregtech will also include it.
About already implemented contents: I think your tools are WAY TOO EASY to get ^^. Couldn't you makes them use Iridium, Lapotron and, why not, adding compatibility with gregtech to makes them using Titanium and Chromium ? Because getting that awesome stuff seems strange for ... so few ressources. To me, it should be 5 times more expensive than Q-Suit, and use A LOT of energy but ...