I would also love to know this. It loads my iPhone first, when I click Import. That's not nice when I have clients in my studio...
Might be helpful to know if you are Mac or Windows users?
Ah, sorry, Mac.
Lightroom version: 5.6 
License type: Creative Cloud
Operating system: Mac OS 10
Version: 10.9 
Application architecture: x64
Logical processor count: 8
Processor speed: 3,4 GHz
Built-in memory: 32768,0 MB
Real memory available to Lightroom: 32768,0 MB
Real memory used by Lightroom: 292,4 MB (0,8%)
Virtual memory used by Lightroom: 896,6 MB
Memory cache size: 74,2 MB
Maximum thread count used by Camera Raw: 4
Displays: 1) 2560x1440
Application folder: /Applications
Library Path: /Users/hans/Pictures/Lightroom/Vrij Werk/Vrij Werk.lrcat
Settings Folder: /Users/hans/Library/Application Support/Adobe/Lightroom
1) ColorChecker Passport
2) HDR Efex Pro 2
3) rc Raw Plus Jpeg
Config.lua flags: None
and I am on windows 7. I would imagine though that this is lightroom functionality unrelated to the OS.