If you don't submit your ITA to time (unless there is a VERY STRONG reason, cleared first with INZ, not something like this), it won't be dealt with at all! No CO, not considered, a total waste of your time and money to have put in the EOI. It would be disregarded as past the time limit.
Also, I have some documents mentioned in my EOI but they are not related with points such as driving license etc. If I do not submit them, would it cause any issue?
I'm not quite sure what you mean there. Read carefully the instructions that came with the ITA pack, and comply with them. Anything that is missing or wrong will be a possible cause of delay, because INZ officials will have to ask for you to supply what should have been there - meantime, your file will go back to the bottom of the pile and have to wait to come to the top to be dealt with, even if you respond at once.