Chunkloaders are really a much needed thing in modded Minecraft, but the bane of servers. I personally enjoy MC more single player, purely because once I turn off, nothing happens in the world. On a server, if you can only play 2 hours a day normally, the chunkloader gives you a 12x boost to the most valuable resource - time.
Only one chunkloader I'm aware off is designed to be active only when the player who made it is online. All chunkloaders should be like that.
I've always hated tree growth in Minecraft (along with infinite milk from one cow, and near instant wool regrowth, ease of food production, and no need for all that food). It's so fast, there's no such thing as deforestation (unless on a very busy vanilla server). Combined with the magical extra energy you get from Charcoal will always make it better. Charcoal should only be slightly better then Logs (as charcoal is a slow burning source of energy). Does forestry configs affect all trees, or just it's stuff, or does the config just affect it's farms, so any other farming options will then be more efficient?
There's a lot of fundamental "balance" flaws within Minecraft, which really mess with mods that are designed within these flaws.
Question you need to ask yourself, once you've used up all the coal/oil that is worth obtaining, what will you use for power then? There does need to me a more advanced form of power, and that's the so called "renewable" such as wind/solar/tidal, which needs either some system that is large to build and each component only producing a small amount of power, or something that is small to build, but needing the same amount of resources.
Yes, there are more advanced forms of energy based on "Nuclear" offered by various mods, but these will still be a non-renewable source of power.
At some point (just like the real world), you'll burn up everything, and be left in the dark.