There was also one version of the Me 262C with a Walter rocket built into the aircraft (as opposed to the BMW jet/rocket engine combo or RATO units mounted on the airframe) in the tail.
Had the airframe been enlarged to suit that seems to me to be a promising idea for fast take-off, climb, acceleration and endurance (especially if the 2 chamber throttle equipped rocket the Me 263/Ju248 was to be fitted with could be used).
I can't find a source on-line but I think I remember reading that the inclusion of the rocket compromised range under jet power due to the space it its fuel took up. No doubt there were CoG weight issues involved....and this is possibly why RATO units the BMW combo were looked into as well.
Although RATO would seem to be a cheap known quantity in the late war (jet) LW.