In regards to the WM startup scripts, flwm.sce and flwm_topside.sce already had a line echoing to /etc/sysconfig/desktop, flwm_topside had a test condition and flwm did not. I spent about 3 minutes adding the line with a test condition to the existing supported WM's and lxde and xfce4.
I just figured folks may like to boot dCore, import a window manager and xorg-all, load Xtc/Xprogs, and then be able to use X without having to reboot. It could also be one less potential cause for X not starting and the time spent troubleshooting that goes along with it, especially among newcomers. And since that line, albeit without a test condition, is in all the regular TC window manager and desktop extensions as well as the use of the boot code, I think being consistent across Core and dCore would only be of benefit.
Also, I have made use of the unicode and language support as well as uXterm by installing the locales-all package.
EDIT: for 5.x, we could consider removing that startup script code from Core and have both Core and dCore use only the boot specified option. That way the expected behavior is the same across Core and dCore.