probably broke the feature when adding the save dumping and cheat menu and stuff into the menu list....or just the menu part is their own work, so they didn't add the feature into their menu when recreating it
With Gateway you can update with roms. You have to hold D-Pad Up (or D-Pad Down, I forget which) when booting Gateway mode. This disables version spoofing. I would advise against this for Ultra 3.0+ users those as this will most likely brick your console if you attempt it on sysnand. It might work on emunand though, but no guarantees.
probably, most of the MT launcher is copied from the gateway launcher, so best just stay on the safe side.....but seeing as the MT launcher doesn't have the option to disable FW spoofing the only way you could really update would be via the internet anyway, so either way you would either update to 9.5 or get bricked, neither option is exactly useful anyway