No.

All entries and credits must remain intact. See credits for further information.

AB	Saudi Arabia	AE	United Arab Emirates
AR	Argentina	AU	Australia
BE	Belgium	BL	Benelux (Belgium, Netherlands, Luxemburg)
BZ	Brazil
CA	Canada	CH	China
CL	Chile	CO	Colombia
DK	Denmark
EU	European Union
FR	France
GE	Germany	GR	Greece
HK	Hong Kong	HO	Holland
ID	Indonesia	IS	Israel
IT	Italy
JP	Japan
KO	Korea
MA	Malaysia
NL	Netherlands	NZ	New Zealand
PG	Portugal	PH	Phillipines
PL	Poland
SA	South Africa	SG	Singapore
SP	Spain	SW	Sweden
TH	Thailand	TW	Taiwan
UK	United Kingdom	UR	Uruguay
US	United States of America

7"	7 inch single
9"	9 inch single
10"	10 inch single
12"	12 inch single
BETA	Video tape in the Betamax format
CD	Compact Disc album
CD3	3 inch CD single
CD5	5 inch CD single
CD+G	CD+Graphics, commonly used in karaoke systems
CDR	Recordable CD
CDV	CD Video, a combined technology of CD and LD
CMS	"Cassette Maxi Single", comparable to the 12" single
CS	Cassette album
CSS	"Cassette Single", comparable to the 7" single
DAT	Digital Audio Tape
DLOAD	Downloadable tracks and albums, e.g. in the mp3 format
LD	Laser Disc video
LP	Vinyl album (Long Play)
REEL	Reel tape, often used for master copies of recordings
VHS	Video tape in the VHS (Video Home System) format

An acetate is used as the cut prior to the cutting of the master disc. It is often used by the label, engineer, producer, or other party to get an idea of the recording once mass-produced.
Acetates (contains no acetate...) are heavier than vinyl and may smell strange. Acetates also degrade quickly when played.

A flexi disc is a thin vinyl sheet designed to be played on a turntable, but so thin it could easily be distributed with a magazine or such.

Because we may not know about the item. Send the maintainer the details and a scan/photo.

Because that would be a lot of compilations. Compilations with very common tracks, e.g., True Faith, will not be listed unless it's a promo, released by Factory, or a unique release from an "unusual" country. It's somewhat subjective...