Hi there,

It is possible for reduce the numbers or can i delet some of the revisions?

Yes you can delete them because those are 'backup' for your blog post, if you required them to be reverted back, you can use them instead of your new changes on your blog post.

This issues have been issued to our developer as we will implement a few add-on on this features. We will see if we can implement this on future release. Thanks for your understandings