There is no modern, standardized Greek cursive script that I know of. If you want one, you'll have to invent your own or steal it from some past time. You could, for example, grab some things from this site
dealing with the cursive script used on a certain document. For more techniques to shorten your writing time and to make your writing more cursive, I suggest looking into paleography; there is a decent amount of information (and a lot of images) available on the 'net, such as this page here
on Byzantine paleography. For images, check out [url]APIS,[/url] the Advanced Papyrological Information System. The more you integrate and develop on your own, the harder it will be for others to read your notes; if that doesn't matter -- and it probably doesn't, as you can easily write anything that needs to be read by others in the more common script --, then go at it.