Whether there will or will not be serials/editions in the filenames, I would still to express my view. Personally, I would like to see the following naming schemes used, using the PS1 version of Akumajou Dracula X - Gekka no Yasoukyoku as an example:
Akumajou Dracula X - Gekka no Yasoukyoku (Japan) (v1.0) [SLPM-86023 (O)]
Akumajou Dracula X - Gekka no Yasoukyoku (Japan) (v1.1) [SLPM-86023 (O)]
Akumajou Dracula X - Gekka no Yasoukyoku (Japan) (v1.2) [SLPM-86073 (PStB), SLPM-87328 (PSOB)]
As you can see, one can easily see which version (v1.0, v1.1, v1.2) is associated with which serial number which is linked with the edition of the game and it looks pretty informative. If a person compares his real life collection with his digital collection, he can see exactly what he's missing using the information above.
Another scenario could be that I as a gamer want to play the best PlayStation version of ADX:GnY. People on the Internet told me that the "PlayStation the Best" and "PSOne Books" editions are the updated versions that have a few new additions not in the original. If I was to follow the current naming scheme:
Akumajou Dracula X - Gekka no Yasoukyoku (Japan) (v1.0)
Akumajou Dracula X - Gekka no Yasoukyoku (Japan) (v1.1)
Akumajou Dracula X - Gekka no Yasoukyoku (Japan) (v1.2)
Then I wouldn't know which one's which. Of course, I could just simply google it, search redump's database or just go for the highest version number. But I think having the serials linked with game edition in the filename can be useful. And I'm lazy and want all the relevant info in one spot.
I take your point that most editions contain games that have exactly the same rom data but I still prefer the existence of serials/editions in the filename à la ADX:GnY (v1.2) rather than without.
My other concern is the treatment of bonus discs as a completely different entity (except noted in the comments section) from where it originates. For example, this is how it currently is:
Tobal No.1 (Japan)
Square's Preview (Japan)
This is my preference:
Tobal No.1 (Japan) (Disc 1) [SLPS-00400 (O), SLPM-87405 (LH)]
Tobal No.1 (Japan) (Disc 2 - Square's Preview) [SLPS-00401 (O)]
The (Disc 1) and (Disc 2) text are specifically marked on the disc labels. The existence of serials and editions in the filename are useful again. From a quick glance, we can see that even though Tobal No.1 was released twice, the bonus disc was only included in the first release.
Now for some inconsistencies:
R4 - Ridge Racer Type 4 (Japan)
R4 - Ridge Racer Type 4 (Bonus Disc) (Japan)
If we were to be consistent, the latter name (Disc 2, the bonus disc) should be "Ridge Racer: High Spec Ver. & Namco Catalogue '98 (Japan)".
Finally a few unrelated possible errors I spotted:
http://redump.org/disc/4684/
The PlayStation the Best serial should be SLPM-86073, not SLPM-86023 (which is the original).
http://redump.org/disc/1410/
VX078-J2 is Konami's internal serial code and should noted in the comments section instead.
http://redump.org/disc/2783/
http://redump.org/disc/2784/
I thought the edition wasn't supposed to be part of the game title. P:
http://redump.org/disc/7733/
I'd go with something similar: http://forum.redump.org/post/18881/#p18881
Kingdom Hearts II - Final Mix + (Japan) (Kingdom Hearts II - Final Mix) [SLPM-66675]
Kingdom Hearts II - Final Mix + (Japan) (Kingdom Hearts - Re-Chain of Memories) [SLPM-66676]
I still consider them (Disc 1) and (Disc 2) respectively though.
http://redump.org/disc/2327/
There does not appear to be an exclamation mark in the game title.
http://redump.org/disc/5481/
Subtitle needs to be added: An/Ann to Greg no Daibouken
Anyway, at the moment I'm still trying to decide how to sort my PS1/PS2 games, like which type of compression to use (torrentzip, 7zip, rar, pakkiso, etc) and whether the final results are freely usable with clrmamepro but before I can do that, I need to decide whether to use my own naming scheme or use redump's.
If all else fails though, would redump be able to offer a custom naming scheme DAT facility in the future?