Just to clarify, the lack of feedback is due to this not being a support forum so no guarantee of us reading every post.
Apart from submitting a support ticket, the best place to go for discussion of our XP11 aircraft is - https://forums.x-plane.org/index.php?/forums/forum/473-c152/
That forum is very active so the development team are usually lurking around and will answer questions where possible.
Our entire XP11 fleet received significant updates in early September to bring them up to the latest XP11.50 standards, including flight dynamics, as well as fixing a variety of bugs that had cropped up since the previous updates.
https://support.justflight.com/en/support/solutions/articles/17000085809-c152-xp-changelog
As Andy has posted, you can adjust the transparency of the menu arrow using your mouse-wheel.
We'll investigate the sounds and add any that are currently missing. There will be some differences in functionality and aircraft behaviour due to the differences in the two simulators.