gerald_clark has answered your question where you want to load extra files from a booted up "boot" list
you may not be aware that Tinycore allows you to create your own lists and you just edit your current bootloader menu or add an entry to allow you to choose different lists
If interested it shows as a bootcode option here
http://distro.ibiblio.org/tinycorelinux/faq.html#bootcodestinycore lst=yyy.lst Load alternate static yyy.lst on boot
let me give you examples where I use a grub2 bootloader, YMMV
linux /64boot/vmlinuz root=/dev/sda4 home=sda4 opt=sda4 tce=sda4 tz=UTC-8 waitusb=5 lst=xbase.lst
linux /32boot/vmlinuz root=/dev/sda3 home=sda3 opt=sda3 tce=sda3 tz=UTC-8 waitusb=5 lst=intel.lst
linux /64boot/vmlinuz root=/dev/sda4 home=sda4 opt=sda4 tce=sda4 tz=UTC-8 waitusb=5
If interested the top line is from a boot menu with the "other stuff" that will boot into 64 bit and use the very basic xbase list I borrowed from the ISO or cd
middle line is my xorg list booting a 32 bit ...its similar to a 64 bit menu but the name of kernel ....I have changed for personal reasons.
bottom line has no mention of list as it will find and boot my "onboot.lst"
those home= etc bits also show I have a fully persistent hard drive setup and am not suggesting you should follow suit.
Hope that helps and good luck