Can Shotcut Incoporate K-Lite Codec Pack for H.264/265/Av1 Playback and Editing

Yes no improvements. After stringing multiple clips together they are 7-35 mins long but performance is the same aka terrible regardless of clip length.

More info:

These clips are native DJI Osmo Pocket clips with 3840x2160, 8-bit,100Mbps data bandwidth, compressed in the H.264 format which the Osmo pocket does in real time.

Example 1m:18sec clip
Video: MPEG4 Video (H264) 3840x2160 29.97fps 99910kbps [V: DJI.AVC [eng] (h264 high L5.1, yuv420p, 3840x2160, 99910 kb/s)]
Audio: AAC 48000Hz stereo 189kbps [A: DJI.AAC [eng] (aac lc, 48000 Hz, stereo, 189 kb/s)]

Media Play Classic: