Using files from Feralheart+ you are able to make the Feralheart trees and shrubs move just like in Feralheart+. You can find the download in the link below but it's only for the trees I'm afraid, no grass.
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=27868.0Not entirely sure but you might be able to make moving grass using the same code as the trees, located in the .material file. I found this:
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As for "moving" trees n such,
it's just a material code.
Format: wave_xform <xform_type> <wave_type> <base> <frequency> <phase> <amplitude>
Example: wave_xform scale_x sine 1.0 0.2 0.0 5.0
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xform_type
scroll_x
Animate the x scroll value
scroll_y
Animate the y scroll value
rotate
Animate the rotate value
scale_x
Animate the x scale value
scale_y
Animate the y scale value
wave_type
sine
A typical sine wave which smoothly loops between min and max values
triangle
An angled wave which increases & decreases at constant speed, changing instantly at the extremes
square
Max for half the wavelength, min for the rest with instant transition between
sawtooth
Gradual steady increase from min to max over the period with an instant return to min at the end.
inverse_sawtooth
Gradual steady decrease from max to min over the period, with an instant return to max at the end.
base
The base value, the minimum if amplitude > 0, the maximum if amplitude < 0
frequency
The number of wave iterations per second, i.e. speed
phase
Offset of the wave start
amplitude
The size of the wave
One that works well is;
wave_xform rotate sine 1 .1 0 .02
Just remember to make a backup of your files just in case it doesn't turn out like planned
