KTuner.com

How safe long-term is the Improved Shifting 2 option? I was figuring that level 1 might be geared more toward long-term use and 2 might be more for track use but I wasn't quite sure. I assume these options are mainly just adjusting the shift pressure?

Very. The feature has been available and in use for many years now. Ask the 9G Accord group for additional confirmation feedback.