I've just some a skill being used where a case was thrown then a radius ring appeared and as long as you stayed in the ring your hit damage was increased, but I can't seem to find the skill , I thought I had them all but obviously not this one, any ideas. Thanks
The +critical bonuses aren't coming from the support station they are probably hitting the button for pulse at the same time as dropping the support station.
The only healing skill that gives you any damage modifiers is the booster shot mod for first aid which I believe is a temporary flat 15% damage bonus.
Ammo cache does also have some slight bonuses to skill haste and if it actually works brings your signature skill back a little faster but I'm not sure that is working.
As usual Rroff is correct. The ammo cache simply means that reloading within the Support Station's radius, it won't cost any ammo. There are a few times/places it is handy. Resistance is one, and the Underground is the other place when that one mission modifier is active. It the one that makes your weapon more stable, but you carry less ammo.
Remember that any full Reclaimer builds will get all 4 Support Station derivatives at the same time.