This is a very simple add-on to replace the "Sign In" button with "Quick Login" in side bar.
Update 1.2.1: Makes it compatible with xenForo 1.2.1 [No dependency on TMS]
For xenForo 1.1.5 and below: You need to have TMS installed; just download and upload contents of the "upload" folder and import the xml file in ACP to install this add-on.
This is what happens:
Hope this was helpful.
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Quick Login in Side Bar 1.2.1
Replace the Sign In Button with Quick Login in Side Bar | Print