For the most part, the T-34C would only need you to adjust the aileron trim once at the beginning of a flight and it was good throughout, except for the occassional really bent ones. Part of why it seemed like you always had to trim it was because the checklist made you reset it every shutdown. On the road (or when standing RDO), I'd just leave it were it was and it was fine, and I think most IPs would do that.
Along with what Jim was saying and for comparison, my plane now has 32% the power of a T-34C, but still "needs" different aileron trim at a high power climb setting than at cruise. You can counter it with yoke just fine, although I do have electric trim for it, which is nice for a long climb. I also need to put about 1/4 of ball back in when climbing, and I don't have rudder trim, so even lower powered planes can still require some adjustment.