to see if DTX is used use command: ZEQO:BTS=1:MIS; where 1 is BTS number.
DTX usage decrease interference so if frequecy re-use is at high level at your network then it is OK.
Half Rate feature is a GREAT!!!!
with half rate you can quickly increase amount of traffic channels 2 times !!! it’s great feature to fight with congestions on overloaded cells !!!