Well, let's define a few things so we don't get confused. What we're going to call the "upper bumpstop" is the snubber which limits uptravel, which, in this case, resides between the upper and lower a-arms and stops the upward travel of the lower a-arm. The "lower droop stop" resides above the upper bumpstop but controls the lowest point the lower a-arm can reach.

That being said, I don't believe the CALMINI kit addresses any change to the "upper bumpstop" except for the fact that you've cranked the t-bars and therefore start off further away from the stopper. Result, increased uptravel and the expense of decreased downtravel.

Now, as for downtravel, I know the CALMINI kit includes some kind of beefier piece for the droop stop, but I don't know if it adds any additional travel or not. Additional downtravel would be a bad thing as far as the rack and pinion are concerned, but I know the CALMINI piece is a stronger snubber, so as long as it keeps the stock range of downtravel, you can use it. If it adds additional downtravel, you may want to consider altering it so it won't allow any additional downtravel.

HTH,
Chris