Make it a short range Eat Tree, but when they actually target the tree they'd have to run over to it, so make the event "Unit is given order (Eat tree, or whatever it is)" Teleport to Targeted Destructible.
Unit starts the effect of an ability
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Ability being cast equal to Treeport
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Order Triggering Unit to Stop (This Makes sure he doesn't eat the tree)
Move triggering unit to target destructible of ability being cast (?I think?)
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.