 Too much CA can be detrimental. There should be just enough to do the job. Too much causes the joint to be brittle.
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The people who engineered your kit are just that- Engineers. Don't second guess them and change stuff around. This could render your model unflyable
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Reinforce high stress joints with epoxy. Use your judgement. If there is a joint you don't feel comfortable with just CA, fillet it with epoxy.
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As a rule, I always put some triangle stock in the horizontal stabilizer/fuselage joint. This provides extra strength and makes covering less difficult.
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Household ammonia can be used as a CA Kicker (it accelerates the reaction/curing time). Be careful, as it dries fast enough as it is!
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Cut sheeting or other non die-cut parts a little bit larger than intended. You can always sand excess off.
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If your kit uses hatches to access the servos or gas tank, soak the pilot holes with thin CA. This stiffens the wood fibers and prolongs the hole's life.
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If you are at all capable of doing it, change the wing mounting system to a cap screw/blind nut system. The nylon bolts are good, but anything that will shear them off is going to total a plane. The extra strength is worth the risk.
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If your kit is a "glue in" wing, shim any gaps with leftover 1/16" balsa and fillet the joint with epoxy.
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Enlarge the fuel line holes in the firewall slightly. The extra room makes installation and maintenance much easier.
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