It's based on an EDL (video) style editing which is inside/outside counts. The OUT is always +1. There is no way to change it to a film style approach which is inside/inside counts. But it is for timecode only, the frames you select are the ones in the cut.
This is what ALL NLE editing apps I work with do. The only thing I have seen that didn't do this are linear tape-to-tape systems.
This is something you just have to get used to. IN always includes the frame you are looking at, OUT also includes the frame you are looking at. Park on a frame, mark IN and OUT...and you have a 1 frame duration.
Tjhat's right and if you want a 20 second duration you mark an In then type +19:24 for PAL land and an out or +20:00 and then nudge back 1 frame. It becomes automatic.
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I know everyone likes to be very technical on this site. But in plain English...no. It will always behave like this. You'll just need to remember to park it back one frame when you jump forward to your out point.