Sure. The only problem is that this could never be part of the rules because there are no rules for managers, there isn't even a rule that says the managers must post differences after play starts
It's just the way it is, people play at first and as players they learn what managers do and then they can try to manage themselves. This "suggestion" that all deadlines should be 'local times' is a good one but there's nowhere to post it. As I said, it can't be a rule and if you post it in the managers thread then those who don't read the thread won't know about the "suggestion". So this discussion is really pointless
Actually there are 2 statements with "CET" in the entry system section in the current TT rule.
"The first entry deadline is always Sunday 6 pm CET"
"Doubles commitments start on Sunday 6 pm CET (the week before the tournament), players that are in the singles entry lists (main & qualy & alt) can now pair up" (this rule changes in 2010, so it can be ignored)
These can be revised with UTC.
And since all TT players usually read the rule thread before they start to play this game, the suggestion can also be added in the first post of the rule thread telling people it's not mandatory but better, so all TT players who'll potentially become managers can be aware of that. The suggestion can be added after this statement:
7. Match deadlines
- Managers will set a deadline at which no more picks will be allowed, even if a point hasn't been played. The deadline will be taken from the official order of play and set at a time when the first match begins.