Iso-Hold Bench Question

Does anyone here have a recommendation for or technical advice in regards to the ‘Iso-hold Bench’?

I saw in a recent Todd Baumgartner article ( 6 Stronger Bench Exercises ) he has that movement included as a means to increase shoulder stability, but he does not include a training regimen. I was hoping someone on here has some experience implementing this lift. I have no idea how to program this movement.

Specific Questions:
Length of time in the ‘Hold’ Position?
Is there a negative involved? if so, how long is the time?
What weight is used? Is it shorter holds for heavier weights?

Any other advice.

Thanks a lot.