operand operand

I would like to change my mathematic script custom that two operands side by side will be inserted an operator * in default. Restrict the operator * must be written or it will not be inserted automatically. Because it is needed to allow two noun operands side by side automatically inserted by the operator ' for compound noun. For this, I am also willing to change my English script custom about ' such as not writing "I'm", "I'd", "I'll", "I've", "It's", "isn't", "don't"...... and just writing "I m", "I d", "I ll", "I ve", "It s", "isnt", "dont" ......