normally i don't change the framerate... expect i need/want to have specific fps. normally i use adobe premiere or after effects and interpret the footage at the project window.
if you render the footage into another framerate... you should have the right properties... otherwise the program renders blended frames inbetween the missing ones which is not what i'm looking for!
MainSys: Z77 UP5,3570K,32GB Ram,GTX 285, M3 128GB,4x3TB R5@LSI9750
VJSys 1: 990FX UD5,X6 1045T,16GB Ram,GTX970+610+610,M3 128GB,3x1TB R0
MBP 3.1; Schenker A102 (650m) & P702 (675m)