There are some feats specific to spelljamming.
-Spelljammer Helmsman: this feat allows you to use skills through the ship while sitting in the helm. Typically, a spellcaster in a helm can power it and do things, but they do not get to add their skill rolls to many skill check (pilot, spot, etc). This feat allows the character use use skill while in the helm through the ship. Note that this does not apply to Knowledge skills.
-Zero Gravity Combat: with this feat, you ignore all of the penalties to hit and armor class while fighting in no gravity.
-Endure the Void: the amount of time you can spend in the limited atmosphere and environment of space is doubled.