Takei would have had a greater part in Trek, but Shatner hindered him. An example would be when in STVI Shatner demanded that the script be changed so that Kirk saved the day instead of Sulu. Remember how the Excelsior was on gaseous charting mission or whatever? The whole "modify a torpedo with gas sensors" idea was supposed to be Sulu's.
There's a reason that Shatner was the only cast member not invited to Takei's wedding.
I don't think that Valter is a better actor than George. He's okay, I guess, but mostly he just rolled his eyes and showed off his wery cheesy Monkees hair.
Completely untrue. The shooting script for TUC included lines indicating the Enterprise also had equipment for "cataloging planetary atmospheres", as so:
41 INT. R DECK CORRIDOR 41
leaving the Enterprise Science Labs...
GORKON
Your research laboratory is most
impressive...
KIRK
Starfleet's been charting and
cataloging planetary atmospheres.
All vessels are equipped with
chemical analytic sensors...
GORKON
This cannot be easy for you,
Captain...
(off the look)
I would feel awkward if I had to
give you a tour of OUR vessel...
The man's courtesy makes Kirk feel guilty...
KIRK
Would you care to go topside?
CHANG
Very much.
CHEKOV
(pulling Kirk aside)
Captain, you're not going to show
them the bridge??
KIRK
(clenched teeth)
Full diplomatic courtesy, Mr.
Chekov...
The party passes Uhura and a YOUNGER
CREWMAN.
YOUNGER CREWMAN
Would you want your daughter to
marry one?