I always forget to equip my kits, and when I'm against the high level players who have built lower level mechs, they tend to use them so I need to as well ^_^

My suggestion is when you buy a kit, it says "would you like to equip it now?" and it is placed in the next available kit slot on your mech.

I voted yes, but with one condition - I think it should be a check-box not something which comes up every time you buy a kit. I almost voted 'no' because of adding another click to the re-equipping process. Making it a check box seems to be the best of both worlds. If there is a slot available, and if you dont have a similar kit, it equips, otherwise it goes to the inventory. A checkbox selected to off would leave the function as it is now.

I voted no.
I think checking its own equipments before a battle is part of being a good player.
If you forget it, too bad for you