Yes. You can have extra taxes withheld from one person to cover the tax liability of your spouse as long as you will DEFINITELY be married filing jointly for the next year.
When married filing jointly your income and taxes withheld are all combined for your federal return, so it does not matter who pays more during the year. However, if for any reason you would end up filing separate returns, the person who did not have enough withheld would have a tax penalty for underpayment.
If you were going to do it, then yes, you would add additional allowances as necessary. You wouldn't be able to necessarily decrease the other persons withholding too much as the least withheld would be married filing jointly with claiming dependents for child tax credits.
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