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Yes, go ahead and install Chapter 2. It adds new mechanics and factions that you can experience quite early on before you even start the Chapter 2 story. Your question reminds me that KG should slap a big disclaimer on SS2's description page regarding Chapter 2. Too many players aren't aware of it or are waiting to finish the Chapter 1 content.
It probably would work worse if you installed ch2 on a well established game. Though this makes me want to ask, are there any issues to play without ch2 at all?