Is it possible to implement "flexible adding/removing connection point" feature?

[Xuesong Lu <cedarlu gmail com>]

Hi, guys,

I love DIA, but I'm very un-satisfied with the fact that DIA don't have
such an important feature, and felt eager to use it in DIA some day.
I believe it will greatly improve flexibity and productivity working
with DIA.

Could you guys kindly tell me why it was not there?
Do you think this feature is less important or is it too difficult to
do?

Thanks
Cedar