I try to expose this idea in minecraftforum.net but its overcrowded with post, so I will explain it again here.
In survival mode, I think that turtles are overpowered. They are too easy to build and with a little of code you can do things better than BuildCraft Quarrys for example with NO effort.
I suggest:
1) Add some kind of fuel/energy that they consume to work (like coal? water? steam? redstones?).
2) Or you can add limits to distance between turtles and some kind of terminal, so you have to spread a "net" of something (other computers with wifi?) to make them functional in a specific range. That "antenas" could be upgraded with some kind of hardware to extends its reach. If the wifi have 50 block limits… maybe turtles must have something like that to limit its power.
3) Or a machine like a dock station that recharge the turtle batteries when a turtle park on it. That machine can be recharged using coal (and/or water… steam) if you don't want to add other new items to the mod.
Some people complains that they don't want a complex way to use turtles… but there is a simple solution:
a) if you want simple… use creative mode (fuel/energy system should be disabled automatically?).
b) if you want some difficult, use survival (gather resources to sustain that turtles).
c) if you want survival, WITHOUT fuel/energy system, a simple disable option in the config file could solve the problem.
Thanks!