I have a small range of hands I like limping during certain times in the tournament. QJ and JT would not be part of that range. If I want to play those hands, I want to raise. Limping is good for slow playing certain good hands, and mining certain small pairs and suited connectors. With this range, you can fold, call, or raise if anybody 3bets you, depending on the hand.
My limping range changes often, but might look like this.
QQ - KK (4bet raises)
22 - 66 (call raises)
56s - 89s (fold or call raises)
Or it might change to this.
AQs and AK (4bet to raises)
A2s - A9s (call or fold when raised)
The reasons I don't put QJ and JT in my limp hands, is because they play much better against single opponents. If you have multiple limpers, even with a top pair flop, QJ can be second best and cost you a pile of chips. With 4 players in a hand, you almost always know how your 55 or 67s are doing. And with your big hands, they become trap hands. A9 might call a couple streets against your AK and an A62 rainbow board. QJ might shove a J94 board when you hold KK.
Only use a limping strategy when you have 30+BB. It is also fine to never limp. I like doing it to change up the game a little. It keeps me from getting bored while confusing some villains.