The items there is nothing to comment (except 2) but is up to larva. Pretty sure is possible (at least some of them), but are too many IMO.
We already have Ultima mag ...is from Ultima's Engine I think
I really really doubt someone would want to lose all his levels to change the ID... we have ID change as a donation, and is used quite often I would say.
The others....
We already have|had crack mode, but was closed due to a exploit.
Higher character stats... we already have higher character (max) stats... if what you mean is every level stats, it can be an issue if you modify this in a different ship then go back to the normal ship... could be ugly.
In fact the client stops at 100, never tried to modify that.. but I don't think would do much of a difference (could be completely wrong).
More quests... not sure how many are there atm but there should be space for more.
Not sure about the casino... probably easy to cheat it as it has happened on other places.
Techs although they could be reset yeah, don't think 5 or 10 would do much of a difference... better just play with a FO on the party and have 30 (or at least above 25, or read the next)
Higher lvl techs sounds interesting... I would rather implement this than the previous idea... but would have to be tested.