Elements has been able to import 1080p60 H264 video as far back as Premiere Elements 7.
Although an editing-preset explicitly for 1080p50/60 video would be the optimal solution, you can get by with using the "DSLR 1080p25/30 (1920x1080p 25fps or 30fps)" preset.
The native-resolution won't be disturbed. And contrary to the selected framerate, all frames of the video are preserved on output. (At least, this was true for Premiere Elements 7/8/9 ... I haven't tested this yet in Version 10.)
The tricky part is sharing/exporting the video @ 1080p50/60. Since Elements doesn't officially support AVCHD 2.0, you can't select 1080p60 from any built-in sharing preset. The only options are to create your own presets from the (2) codecs that support 1080p60 export within Elements:
(1) Share -> Computer -> Windows Media Video
(This will create a Windows Media Video file...fine if you just want to watch on your PC.)
(Since there's no builtin preset for 1080p60, you need to go to 'advanced options' and edit the fields yourself.)
(2) Share -> "Mobile Phones and Players" -> "iPod and iPhone"
(This will create an MPEG-4 file with H264-video and AAC-audio, should be compatible with multiple-platforms and media set-top boxes.)
Then click on "Advanced Properties", and manually change these settings:
Level: 4.2
Profile: High
Frame Rate [fps] = 59.94 (yes, that's the correct rate for NTSC)
Frame Width 1920
Frame Height 1080
TV Standard NTSC
Bitrate settings
Bitrate Encoding: CBR (VBR has never worked correctly for me)
Bitrate [Mbps] : 28Mbps (lower number takes up less space, higher number has better quality)
Select Key Frame Distance
Key frame Distance: 30 frames (higher number takes up less space, lower number has better random access)
