My JR XP7202 allows me to have individual trim settings for each flight mode. So for example (I don't) if I had 5 clicks of right cyclic to counteract the natural drift to the left, and I switched to idle up, it would be at 0 clicks, and start drifting. I know a properly setup heli should have a perfectly leveled swash and no trim, but just in case it doesn't, this is something to at least give a little thought to.

I usually trim my heli in normal mode, then copy the trim settings to my idle-ups, then if they need to be adjusted in flight I can at that point. I usually only need about 1 or 2 clicks in any direction. My forward/backward trim changes almost every flight though, b/c of different battery weights, and just never putting the batt in exactly the same spot.