Then play away. The increased damage version of HM was changed to, and I quote:
“No longer a Marksmanship Talent. Apply Hunter’s Mark to the target, allowing the target to always be seen and tracked by the Hunter. Only one Hunter’s Mark can be applied at a time.”
No need to bind it.
(edit: I mean I guess for people who PvP they might need to bind it for rogues and druids? I don’t PvP though)