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Bf109 elevator trim was not heavy to operate according to pilots I've talked to. They used it to help in recovering from steep high speed dives as the control stick got really heavy then.
Aileron trims on Bf109 were metal strips that were adjusted on ground after test flights for desired result. Usually for cruise speed or speed region of around 300-400km/h. Some pictures show that at least Bf109K-4 had flettner tabs in ailerons to lighten control of them at high speeds.
Bf109 had no rudder trim, but later models with the higher wooden tail had flettner tabs which assisted to counter heavy loads at high speeds. This was used from G-6 and onwards.
Hope this gave some info..
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