Yes, 110 blocks can be jumpered that way by not cutting the jumper and looping it through each pair you want to connect, and cutting it at the last one. 66 blocks work just fine doing this as well. If you are experiencing problems with your 66 block connections, perhaps it is not the correct wire or you are using the wrong tool. Generally they have a very good reliability factor if installed correctly.
Siemon makes 110 block kits with C4's and C5's to terminate 4 pair cables, and a kit with all C5's for 25, 50 or 100 pair cables. Part numbers are S110AA2 and S110AB2. I pay about $22 dollars for them from Graybar Electric.
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com