I can think of three main issues: structural (energy absorption capability of the gear), aerodynamic (flap limiting speeds) and braking (will they be up to it?).
In terms of the gear, unless you slam it in (which you can do at less than MLW) there are some quite generous assumptions and safety factors involved, so more for awareness than anything else. Aerodynamic? All the types I know have a OEI flap setting which has plenty of headroom at MTOW and at weights not too far above MLW would be able to use any setting you needed. Braking - you have figures in the QRH, so can plan for max reverse and a low brake setting if you need to, and select a nice long runway into-wind if possible.
In summary, you are outside normal ops but it’s not the end of the world. I suppose if I was faced with the situation tomorrow, I’d call up company/engineering and ask what they wanted me to do. If they said burn down to MLW, I’d drop the gear and pull the speedbrake to get it over with a bit quicker. If you were the owner/operator, you’d probably try and balance the likelihood of the aircraft getting broken (pretty low, never heard of this happening) against the cost in fuel, time, passenger redirection/slipping and engine hours to fly around until <MLW.