Currently to gain rubber one must shove a treetap into the tree and pull it out again, and over doing this will render the tree infertile. Instead some sort of bucket with the tree tap should be hung onto the tree, it would be left over time and when the player would come back to the tree he would find more resin! My suggestion is not to turn the resin itself into a liquid. Maybe a system could be implemented were the more leaves or how tall the tree is the greater the production of resin this will allow for more selective growing and realistic tree treatment, i mean really... if you cut off all the leaves of a real rubber tree do you really think it will still produce sap? I know this is possible, just look at he new snapshot with cocoa plants growing on jungle tree! will it be too hard to do something like this with rubber trees?