You can only see one at a time, so what sense in loading more than one at a time? It's no more work to add the next clip than it is to switch to the next clip when multiple clips are loaded.
I know that I can only see one at a time... However, it is vastly faster to load up 20 or more clips into the source Mon. And then use Key commands to switch to next and previous instead of going back to the project panel every time... Coarse-trimming 1000+ clips is saving you hours litterally..
If you have less than 20 clips then OK... Doesn matter But this app is called PRO and should behave as such !
Would be interesting to know the specs of the workstation that you're attempting this on (particularly of your storage). The conforming process occurs right after adding and perhaps this is what is responsible for not being able to play afterwards? I've added quite a few clips of various encode types at a time - not quite of the magnitude that you speak of, but CS5/5.5 has seemed to hold up well.
I can add 30 clips the SOurce viewer NO PROBLEM.. I just cant add them Simultaneously.
In fact selecting 20 clips and adding them all to the viewer in one go cause the problem to occur.
Mac Pro Nehalem 16 Core
Mercury Engine with GTX285