Preview uncompressed RGB source doesn't work

[Selur]

BTV, what the Hybrid's setting I can use similar to: AnimeIVTC(mode=4, omode=1, aa=4, dark=1, thin=10, aapel=4),

No clue, I don't use AnimeIVTC. Would have to read through https://github.com/realfinder/AVS-Stuff/...eIVTC.avsi

And not atm. I do not plan to add support for AnimeIVTC:
Just looking at the options:

function AnimeIVTC (clip i, int "mode", int "aa", int "precision", int "killcomb", int "cache", bool "ifade", float "sfthr", bool "sfshow"\
        , val "chrfix" \
        , bool "blend" \  
        , bool "normconv" \
        , int "pattern" \
        , int "pass", bool "rendering" \
        , int "bbob", int "cbob", string "edimode", int "degrain", int "omode", int "cthresh", int "blockx", int "blocky", int "MI", int "tfmm", int "pp", int "metric", int "micmatching", bool "mChroma", bool "Chroma" \
        , int "i1", int "i2", int "e1", int "e2", int "e3", int "p1", int "p2", bool "dchr", bool "palf", bool "tcfv1", bool "nvfr", bool "real30p", bool "autoAssuf", int "ediandnn", bool "o3025cfr", string "bbob4_params", bool "crepwithtdeint", int "tdeinttype" \
        , int "overlap", int "pel", int "search", bool "nnedi3pel", val "credconv", int "mode22", val "ediext", string "bob4p", clip "extbob", string "extbobf", bool "repwithtdeint", bool "bobpresmooth", string "cbob4_params", bool "tdeintsharp", val "prefiltered_i" \
        , float "dark", int "thin", int "sharp", int "smooth", bool "stabilize", int "tradius", int "aapel", int "aaov", int "aablk", string "aatype", int "vidDetect", string "d2v", string "tfmtrimIn", int "threads", float "autoAssufthr1", float "autoAssufthr2", float "autoAssufmthr", int "tfmslow"){

Since I don't know what each of these does and when it is used and when not and what ranges each parameter allows the only way to add support for this would be spending tons of time to read the script over and over to figure out all the effects and dependencies.

have you considered incorporate MDec2 or MultiDecimate into Hybrid?

No, haven't thought about it probably since I never encountered a clip where sRestore didn't work fine.
In case there are Vapoursynth ports of those I can look at it. (not really using Avisynth much these days)

Cu Selur