[eluser]TWP Marketing[/eluser]
It could be, but you're talking about HTML and how the server handles URL's, which doesn't include an array parsing ability. That is outside of CI's venue.
If you have so much information that it must be passed in an array, POSTing the information is safer.
If the amount of data is smaller, say under five fields, you can make a long URL with a segment for each field. I wouldn't try to do much more than that many, although is it technically possible. Look at the ugly URL's generated for some of the large catalog sites.
[EDIT spelling...]