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Hi, yes you can by using the Crop Overlay tool in Develop ('R' key shortcut) - it's the first tool icon under the histogram; position your cursor outside of the image where the cursor turns into a bent double-headed arrow, then click/hold & rotate manually, or pick the Angle tool and plot 2 points as a start and end point along which to straighten, such as along a horizon or wall, etc. You can also adjust by entering an exact value in the Angle tool's amount box, or click in that box and arrow up/down (on your keyboard) to increase or decrease the value as a fine-tuning.
Yes. You can do that in the Develop module using the Crop tool. If you are leveling horizons then choose the straighten tool in the crop dialog and drag along what should be the level horizon.
