Bootloader0.7.0.rc.1 used with 0.6.2

I am about ready to get a 1,000 devices flashed for a production round. Would there be any down fall if the 0.7.0rc1 bootloader was flashed and used with 0.6.2 Firmware?

Also is there any concern that the Bootloader is at rc? Will it automically update to the released version again 0.6.2 ?

This is what I would like to do:

P1 starting out with 0.5.3
Flash 0.7.0rc1 Bootloader
Upadate to 0.6.2 system parts
Flash Testing Firmware

I mainly like the realy fast DFU transfer speed.