While this is an old thread, I too came here looking for answers. Anyway here is yet another way to automate rubber collection.
Thaumcraft 4 golems can chop down rubber trees. Use a lumberjack golem, a "use" golem (to replant the trees) and a gather golem to gather the drops.
This page contains the best summary of items that can be scanned by the scanner that I know of: http://ftbwiki.org/Scanner
Oak wood, wool, ender pearls, ingots, and sugar cane are (sadly) not on the list. Coal dust and the ores listed should be possible. However the scanner/pattern storage/replicator are a bit buggy so there are some things you can try should they not work:
1. Remove and replace the scanner.
2. Restart your game.
3. Always save patterns to crystal memory. That way if anything weird happens to your pattern storage you have backups.
4. Lastly, I backup my game (using Checkpoints mod) before I scan anything. It's overkill but if anything weird happens I can always start over.
#1 and #2 have worked for me before when my scanner bugged out.
I know of two ways to do this. The first way uses ComputerCraft and OpenCCSensors: http://www.computercraft.info/…x.php?title=OpenCCSensors
You can use the Gauge Peripheral to get readings from energy storage units, and then create a program to do pretty much whatever you want at any given power level.
The second, easier way is to use a redstone comparator which will output a signal proportional to the energy in the unit (between 0 and 15). However there is a bug with this method. The comparator only updates it's value when the block updates. So the way to get this to work is to constantly update the block next to the comparator. This can be done with a redstone clock. I recommend the redstone clock from the excellent "Extra Utilities" mod: http://www.minecraftforum.net/…e-extra-utilities-v1-1-0b
Place the clock on either side of the comparator and it will keep it updated. Note that this will not get you exactly to 50%, since the signal from the comparator is 7 at 46% and 8 at 53%.
Here is an image of the arrangement, which I use to keep the geothermal and semifluid generators from constantly cycling. Instead the MFSU bounces back and forth between 75% and 100% power (accomplished with an RS NOR latch).
