Try downloading some RPGs made from rm2k3 and just copy the system used in them I know four of those games have a script that allows them to use Summons Magic and Techniques or something like it just copy that and change the name. As far the limit break thing goes I know of a FF fan game that uses that also, once again copy.
Register as a member and then go to the downloads section. They have all you need in the RGSS Scripts section. Just download tthe demos and then copy and paste the scripts.
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