Putting in a chooser is pretty straight forward. You'll need to use the Custom Expression field to do it. I'll take a look at it tomorrow if you need help putting it together. The +2 to caster level will have to be text-only, but you could make it show in specials so its more obvious to the user. The last one doesn't sound like it would be hard, but I've never really done anything with the metamagic feats. I'll take a look at this too, but I imagine there's a field that can be altered for the chosen spell.
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