It seems that this is game is going to have an awesome TAS (:
Here is a movie of Crystal Flashing Mother Brain; I don't know why I didn't work for you, Drew, I have no problems doing it....
http://dehacked.2y.net/microstorage.php/info/2709/CF_MB.smv
Some Notes:
-You need to get hit one time before you can shoot diagonally or move after you get the Hyper beam
-I get "infinite" Super Missiles in the movie. I have been able to get "infinite" Missiles;Supers; PBs, Missiles & Super and Super & Power Bombs. It seems that if you refill your energy almost all the way, then you'll get "infinite" PBs and if you refill only very few of your energy, then you'll get "infinite" Missiles etc.
-Getting hit by the Hyper beam a second time will get rid of this "infinite" ammo. I therefore haven't been able to get into the escape with "infinite" Super + PBs...
-I don't know if there is any possibility of getting "infinite" Missiles, Supers & PBs. If there is though, then it might be possible to glitch through the celing via Crystal Flashing in the very first room in the escape and skip some rooms there this way. Don't forget that Crystal Flashing takes away your "Free Shinespark" though.
I don't know if this will end up being faster at all though with all these other items you would need to get ^^;
This might be known (it's not all that hard to find), but turning around in water and spin Jumping afterwards will send Samus further horizontally (<- that is without Gravity Suit). [I only watched Drewseph's TAS up to the last Chozo statue as the movie desynched there and I didn't bother to download the .avi yet, so I can't tell whether this is already done in there]