under kde 2 this tex-shell is called ktexmaker2. In kde 3 the same program ist called kile. If you install ktexmaker under kde3 the program do not work correctly. For example the menu line is scrolling and the program crashes very often. So either ktexmaker2 should be masked or the ebuild must be changed. If the kdelibs are higher than kdelibs-2.2.2 it is not allowed to install ktexmaker2. Instead of that kile should been installed.
KDE 3.x and 2.2.2 can coexist on gentoo, and if you install ktexmaker2 (but not kile) it will work in kde 2.2.2. I don't think anything should be done about this specifically, because I'm considering retiring our kde2 ebuild set entirely, in one way or another. However all this must happen after the freeze since it involves numerous package updates, among other things.