hi again

,
yeah ok link constrain is a cool controller, so I think is one good way to do this - by hand.
Is it possible to create a key for link constrain ? because now I have to tell my object with link constrain that it has a link to another object at frame for example 140. Yeah I have a key on my timeline and I can offset him but on my right side in link constrain option I have wrote that the link is made in 140 frame.
You know what I mean ?

So, when I'm posing my character, first blocking than I don't want to worry about when I link constrain use - I want simple tell him that - "hey listen, please link now to the tree, ok but now in another frame to the another object" thats all. And max will create me a key for these links and I can offset this in my blocking stage for creating a timing, without looking to options of link contrain in my right side. Is this possible ?
Thank you for help

, regards,
luq