Just created a test using ptp2 beta 5 upon opening the project I removed all plugins and added them all again in the beta 5 version.
Here is the test link: www.irisimage.com/360-degree-gallery/beta5-test-tour
I've viewed the tour on a Nokia lumia 520 phone windows 8.0.10328.78 and in desktop mode the combo box is a good size and the simple thumbnails are now correctly resized.
In mobile mode, the combo box is larger but still functional and much better then the previous version were the combo box filled the entire screen. Image compression is much greater when in mobile mode, much more pixelated on block colours I felt.
One issue I've noticed with the simple thumbnails if you load in portrait mode and then rotate to landscape the top thumbnails are not visible and can't been scrolled down, however if you refresh the tour in landscape the thumbnails load correctly. The thumbnail size is now correctly proportioned for the screen in both desktop and mobile mode though.
In ios7 safari 7.0.4 the bottom thumbnail is still cropped slightly and the control bar is cropped, if you rotate the ipad to portrait and back to landscape the whole image moves up and the control bar moves up as does the combo box. I'm sure you are aware of that one though.
Hope this info helps with your plug in compatibity checks, looking really good now guys, excellent work.