TASK DEFINITION: Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.
PROBLEM: I am referring to someone who makes people 'buy' what he says and gets things done by them through nothing but clever speech something one can describe as crafty or beguiling, but not fraudulent. I pondered over con man and con artist for a while but those terms seem to hold a hint of crime, so those terms won't fit in. I am wondering if there is a more suitable phrase or word.

SOLUTION: Sophistry is crafty speech intended to deceive, not necessarily out and out lying. So then a sophist is someone who does it. This is mostly just to win arguments though, not necessarily to get people to do things. That would be a demagogue, but that is someone, yes, who is clever with words but in a very specific way, appealing to the listener's baser instincts.

PROBLEM: For example, let's say I'm copying instructions by hand. The original instructions say: Multiply the first by the second Integrate the third with the fourth Integrate the third with the fifth And on a page I write: Multiply the first by the second Integrate the third with the fourth '' with the fifth I know this example is silly, but hopefully it's clear what I mean. What is this called?.

SOLUTION: They are ditto marks. ditto stems from the Tuscan dialect of the Italian detto - 'said'; Latin dictus - 'said'. Oxford Dictionaries Online.

PROBLEM: Is the word 'Customizable' a valid English word? Every time I write that word, the spell checker underlines it, and it suggests using 'Customization' or 'Customize'. I'm not a native English speaker, but that word exists in online dictionaries so I wonder why the spell checker underlines it.

SOLUTION:
The Oxford English Dictionary in its revision of March 2012 defines it as: That may be customized; able to be changed to suit the requirements of the user. Frequently with reference to computer software and hardware. The earliest citation is from 1960. If that definition of customizable suits your purpose, then there's no reason why you shouldn't use it.