it looks like you are not informed
1950(shorter game) - can be longer with TTDPatch (eternalgame, startyear)
ugly temperate grass - can be repainted/replaced even with tto graphic using grfcodec
wierd monorail - can be turned off with TTDPatch (unifiedmaglev)
bad monorail depots - can be repainted/replaced using grfcodec
lesser vehicles - new vehicles can be add with TTDPatch
bad new industry grf - graphic can be repainted/replaced using grfcodec
wierd farm system that covers too much. - as for me it is more realistic (and only 1 of those you said isn't already added/fixed/possible)
and much more... - I doubt you will find something that cannot be changed (or already it is) with TTDPatch/grfcodec/other tool
tto will rule until sumone make the long awaited hybrid that eliminate ttd's minus and adds ttd + to tto.
there is that Hybrid, TTDPatch called, if you will use proper configuration you can change game in very many diffirent ways
first then it will rule...
I doubt but at least it will be better for you
so do it yourself ... get TTO, grfcodec, read some tutorials how to create graphic (search the forum, there were plenty of topic about that)
ps. don't reply here until you start doing this project, otherwise don't (digging without purpose is bad) 