DM is your fr'i'end you MUST trust him if he kills whole party you can always gang up and bit him irl 
And on the very beging of DMG there is rule that DM can change any rule as he wants. I think he can't change only the rule that he can change rules.
DM is the man whos work is to make sure you have fun.
At last 2-3 time i saw how bending changing rules were really awesom idea and gave us (players) some fun.
Quarrels about rules are really poitless and west of time.
If you decide that he can't dispel your daylight spell sudenly tunel might 'accidentaly' colapse killing you all
IMHO i would choose to get daylight dispeled anyday 

And on the very beging of DMG there is rule that DM can change any rule as he wants. I think he can't change only the rule that he can change rules.
DM is the man whos work is to make sure you have fun.
At last 2-3 time i saw how bending changing rules were really awesom idea and gave us (players) some fun.
Quarrels about rules are really poitless and west of time.
If you decide that he can't dispel your daylight spell sudenly tunel might 'accidentaly' colapse killing you all


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