What you're looking for seems to depend more on the reading software than on the particular device. You could try ezPDF Reader, that one saves comments right into the pdf file. Works reasonably well on my T68, only complaint would be that the touchscreen isn't super accurate so typing longer bits on the on screen keyboards is a bit cumbersome because you may mistype more than you're used to.
For screen rotation, there are a number of apps on the playstore, just look for "rotate screen".
Hope this helps.
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