Cutting extract recipe in half

I'm trying to come up with a pumpkin ale recipe and here's what I got so far for a 5 gallon batch. I only want to make a half a batch. Is it safe to just cut everything in half, or do I have to consider other things? What about the yeast? Do I still use a whole package?

7 lb Amber LME
.5 lb Cara-pils/Dextrine
.5 lb Caramel Malt - 60L
1 oz Hallertauer 45 minutes
.5 oz Cascade 2 minutes
.5 tsp cloves
.5 tsp ginger
.5 tsp nutmeg
1 tsp cinnamon
1 cup brown sugar
1 package Wyeast 1056
5lb pumpkin

Spices will be added at the end of the boil. Pumpkin and grains will be steeped prior to boil.

I want to make 2.5 gallons of beer so I'm not drinking pumpkin ale in spring.

Yes, no.
See below.
May as well.

Yes, no.
See below.
May as well.

By the way, you really need to do a mash to get much out of the pumpkin (other than starch) and the dextrine malt.

I don't have the equipment or knowledge to do a mash.