How would it benefit the server: Less lag and people complaining
Potential Issues/Exploits: n/a , just blacklist them
Additional notes:
Today there came a user to server 2 and asked me to let some admins to go to server 1 because apparently hobo's were spamming trees and causing lag. I joined the server and apparently a moderator was spamming trees in spawn and everywhere and it caused mass lag and fps drop. Ive got already 6 people complaining about it. So my suggestion was to remove the trees. (I asked him to remove it and said : "its allowed, not against the rules"