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The manufacturers certainly won't condone it - whether you can do it depends on the make and model of the specific device.

Actually you'll find most "unmanaged" switches have the same circuitry and hardware as required for those managed functions - hence even the £5 DIR-615 can be software modified to perform all the functions of the GS108T above. Except the gigabit part.

It's often actually cheaper to equip home wireless routers with switches incorporating those management functions than without, so most do by default - hardware wise that is. It's only the really high end (large enterprise/carrier/ISP grade rackmount chassis) that have real dedicated hardware for management features, often business/SME stuff is just a few lines of code layered on top of some standard ethernet chip