going through any proxy will show the IP of them instead of you, there is a lot of IP tunneling software out there to make you look like you have an IP from singapore... And if your really scared you should look into howto spoof your mac address (not apple - media access control), really easy in linux (software called macchanger) as this is the low level hardware address that attaches an IP to a computer, your IP from your ISP will change, MAC addresses are permanent.
you dont need mod privlidges to track user IPs from site, It would be super easy to track the IP a user logs in under (as long as you know about crosscripting).
if you have a small grow don't worry. they are after grows that can be titled as a "grow op" not a small personal stash. A small grower who doesn't make a lot of money (just saves money by not having to buy from drug dealers) also doesn't look good in court, it makes pot growers look like normal people (which they don't want the court making laws to accommodate small personal amounts).
On a different note: I am developing a piece of software (cross platform!) that keeps track of crops, nutrient profiles, and nutrient products (it is pretty smart on the cross product basic amount calculator aspect =) . It is all based around a calendar and can store information about your feeding schedule as well as photo and video.
Best of all , there is a custom file format that saves everything in an encrypted file that un-crackable (AES-twofish-serpent) and stores everything in a hidden partition so that even in the case of a court ordering you to give the password... yeah f*x you. encryption similar to trueCrypt if you are familiar with that tool.
If schedule goes to according to plan I will be looking for beta testers around here in a month or two..