Just add some system about this on osu! ???
Not submission but technically...

Until now, we added title extension for specifying its length easily, not for following the real title.
Maybe length shown in game can specify the music. But we don't know whether there exist Full ver. or not through the length.
I really don't see big problem with thing that we did until now.

As arken1015 said, adding some system might be a good solution.
Have any ideas?

for TV Size, it has been used for a long time in our history, and there're already many players choosing maps by this. as full version of OP/ED usually get mapped, it does be a effective way to let us tell the difference between them.

second point, if you find the title in PV and CD booklet different, they should be both acceptable. I'd suggest using the one which is different from other versions' though

about the system for this messed things, I think showing the length of the longest diff in the map list would help in searching, and even the titles are the same, it's still easy for players to get what they need

From the wiki

Refrain from using Short, Full, or Cut Ver. in your map title unless the extension is listed in the song's original title. Refer to Wikipedia, Google, or the album track list to confirm.

According to its logic, also TV Size must be removed.

EDIT : OK, I understand what this means.
It seems the video(OP/ED) can't be supporting evidence.

did you not read this part? unless the extension is listed in the song's original title almost every TV size has this in it's song title for real

Okay, I have to ask about some example like for kors k vs. L.E.D. - SOLID STATE SQUAD
http://osu.ppy.sh/s/15630
http://osu.ppy.sh/s/27148

I never played beatmania, but how should we handle with them?

Another example is fripside - future gazer
http://osu.ppy.sh/s/23102
http://osu.ppy.sh/s/33575

There is also something with Yousei Teikoku - Kuusou Mesorogiwi, but it is the same as the second example.
They are already ranked, I know, but for the future if this happens again, what does the creator have to do?

Honestly, the status quo was much better than this.
Too many grey area maps that arose from this change.

What's so hard about researching it in whichever source you have?, it's as black and white as if it's in the official title = yes, if it's not = no

Grey areas:

Easy.

1. Add 'Short' to the tags to aid those searching for Short versions
2. Look at the Total Time / Draining Time information provided on the site.

Having it in the title is more convenient though.
The beatmap listing doesn't exactly have the draining time/tags listed.

then you would use what is in the legit title I'm not seeing the confusion here it is quite simple