I use the dgVoodoo2 DirectDraw wrapper to enable integer scaling in Jazz Jackrabbit 2 Plus while playing it in fullscreen. I play with the resolution 800x540, so that I can use most of my 1080p screen's real estate (2x integer scale thanks to dgVoodoo2).

However, Jazz Jackrabbit 2's original title screens was made in a 4:3 aspect ratio in mind if I'm not mistaken. Probably in 640x480. It gets stretched to fill both the height & width of the selected game resolution, the original title screens of Jazz2 gets stretched in both directions in my case. Way more stretched in the width though. The included Jazz2+ title screens fits way better though.

Is it possible to make the title screens being displayed in their original resolution, regardless of the selected game resolution by maybe adding a few lines of code? Or is this way too much work because of lack of the source code for Jazz2 (to be frank I'm puzzled how Jazz2+ is possible without the source code of Jazz2)?

This is nothing I mind very much really, as I just look at the title screen for maybe max 3 seconds before moving on to the main menu.