Not wanting to start a new thread for a similar question:

I'm building up a Surly LHT and want to use 9 spd Dura-Ace downtube shifters. So far my drivetrain component list is:

-9 speed cassette 11x34
-Shimano 105 double chainring
-Shimano Deore SH-RDM510A rear derailleur

Waiting to purchase a front derailleur until I get everything squared away. I know it's kind of a weird setup, maybe too strange. I've been waiting on answers from Shimano, but have yet to hear anything back yet. So my questions are:

1. Does anyone know if the Deore rear derailleur will index with the DT shifters?
2. If not, I'm fairly sure 105 will work and Ultegra should def. work. Will a GS rear derailleur have the capacity for 34teeth on the cassette?
3. What's the difference between Max rear and Max capacity?

Thanks!