Limp-folding

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If it's tighter (2-4 players), raising AJ is probably a mistake (IIRC, SSHE recommends that you call, not raise). The reason is that in such games, raises discourage action, but calls encourage it. Limping increases the chance people will play even more than folding!

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If the game is tight aggressive, I think it's safe to throw AJo away up front.

If the table is weak-tight, limping isn't going to get too much action in the first place. Besides the fact that open-limping is generally pretty weak, I would rather encourage less action w/ AJo.

The reason? Well, if the table really respects UTG raises, then you might win the blinds right then and there. Secondly, AJo is the archtypical TP hand. TP hands tend to prefer less people in the pot to hold up (sometimes UI).

I do see merit in limping with AJo utg if you know that you'll just get a bunch of cold callers. But this is really a personal preference than anything. I think raising is still better as these players in this case will see any flop with what they consider "okay" hands; you should get your money in when you have the equity.

Of course, pf play can have some personal preferences and variation.