For the temp rocket emplacements missing settings: Click the SpawnDefinitionIDList, find out what presets the spawner is pointing to, and then find and edit those presets instead of the spawner.
Spawners only spawn other objects, you can't edit those objects' settings from the spawner dialog.
(Don't mind that these are APB settings, I couldn't be bothered to get the ren LE for this )
For pickups that increase health instead of restoring: Under the settings for Powerups, check out GrantHealthMax and GrantShieldStrengthMax, and the associated "tick this for percentages" boxes.
If those boxes are unticked, the powerup will increase the user's max health or shield by exactly the number you put in the Max box, but if they are ticked, it'll increase max health/shield based on a percentage of the max health of the user's character class (where 1.00 = +100% max health).
So in this example screenshot, this pickup with 0.1 in both GrantMax and the percentage options ticked, increases the user's maximum health and shield by 10% (and also full heals due to the 999, if you don't want that just set those to 0), which would give +5 max health/shield if you're using a character with a fresh max health/shield of 50, and +100 max health/shield to a character with a fresh max health/shield of 1000.