Since your making a pale ale, a thing to consider is if your raising the abv,your also going to get less ibu's.I would hate to have this start getting confusing on you but if its a short boil already and you do decide you want to add like 1/2-1 pound dme, then you may want to boil that with some hops, which would mean you have to know the aa's of the hop to get the ibus you want for a 60 min boil.You also have to configure evaporation loss in the boil with your water for your 2 gallon beer. But i would just consider a 45 min boil with a small amount of hops.You have that to consider also, so if this is getting to confusing for you know, i would just brew this as is, then learn what you need to do -read How to Brew online or get the book.Learn it before you brew it. Or if you do change it,work with us before changing it/guessing and brewing it yourself.If you add to this kit your basically making your own recipe and you should know how to go about all of it first before just throwing stuff in.Not trying to sound harsh- there are just some things you need to know first.
I couldnt have made a better decision than to spend a few months here researching before deciding what to get and how to go about brewing it. Happy Brewing!