sorry for the lack of updates, I don't have as much free time as before.
I just published a new update to fix chd and prevent people to even try to run ps1 games on a base 3ds (it doesn't work, trust me). no new core this time, sorry. I'll see if I can make a core update in the future, I know retroarch was affected recently from a cyberattack and some cores suffered regressions because of that, don't know if pcsx-rearmed is among the affected cores or if the issue was already solved but didn't want to risk accidentally downgrading because of that.
as for customizing the banner and sound.
I wanted for these tools to be easy to use and hassle free, so I won't be adding that option as it would make my work of maintaining it harder as well as creating confusion among new users. sorry about that.