rEFInd has this feature: It can load a bios bootloader despite running in
uefi mode.

I consulted grub documentation, and it doesn't mention whether grub
supports this feature. So it seems grub lack this feature. If grub
officially doesn't provide this functionality, how can I implement it
manually? Is it possible to do some coding and add a new module to grub-efi
so as to chainload bios bootloaders?

Loading a bios bootloader when running in efi mode is very useful: In some
cases, people has a major harddisk with os installed in efi mode, besides
he has a secondary mobile disk with a rescue os installed in bios mode. If
he uses grub, everytime he switches beetween the two os'es in the two
disks, he has to go to the motherboard settings to change the boot mode. It
is pretty inconvenient. So I hope grub will support it officially in the
feature releases.

BTW, when will the stable version of grub 2.02 release? Do you have any
release plan (i.e. how often is grub stable version released)?
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