I just read that a fan has compiled a Treecapitator version for servers, which is much better than Choptree in my opinion. The port is based off of the single player version, and so will likely contain the same config options to destroy/drop leaves. perhaps if the port is successful, we may see it included in a future version of tekkit. the link to the page is:
http://www.minecraftforum.net/topic/1009577-125-daftpvfs-treecapitator-smp-now-ingameinfo-crystalwing-startinginv-floatingruins/
Note that this page is linked from the original post of Treecapitator. According to his page, he is on hiatus and the new thread will contain all future updates. As such, the port can be considered official.