Holding the pump handle is not necessary with a firm return spring. I run a firm return spring inside the pump handle and the pump stroke is still nice and light.
The pump twist on the t2 is very minimal and not an issue unless your very rough on them. Thst said, i would highly recommend the t grip if they offer it with the new Quad Rod kit, the t grip is my favorite.
If i had to choose just one CCM it would be my S6.5 with t grip.