which plans have aileron trim?

[KG26_Alpha]

You have to assign keys to trim the ailerons.

Start IL2 then

Hardware set up> input> Hotas control
Under Aircraft controls section > Ailerons Left> Ailerons Right> Ailerons Centre

Set your preferred keys and you should have trim done some aircraft.

If you have already done this and still cant trim make sure the keys you assigned are not "F" locked or require another key on your keyboard to activate them.