Question / Help Using Matrox Codec with OBS Studio

Is it possible to use codecs like Lagarith Lossless / Matrox with OBS Studio?

My current settings (only record):

uc


When I drag a clips end point / position cursor on timeline in Vegas 14 (Build 201) it is quite laggy updating compared with Matrox Codec:

Have tried changing the B-frames and Keyframe interval as I know Vegas likes keyframe interval 1 from when I used x264 codec with dxtory, but I cant seem to get it to drag the clip size smoothly using NVENC and makes editing a pain. All works blazingly fast with matrox.

(This is not a PC issue btw, the rig I have is beastly).
 
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