It worries me a little that I don't even know what you mean by "build road to location." I've launched Col without mods to at least refresh my memory a little bit – a route-to mission obviously exists in Col ...
Dot Map and
FoV slider sound good to me. Not sure how you could let players hide the slider. (I don't think most players use the slider much once they've found a value that they're comfortable with.) In BUG, the slider can be toggled on and off on the BUG options screen; maybe a key combination could be used instead. The options screen might be the biggest single contribution of BUG; it's great to have a (easily extensible) place for any non-gameplay options. (But adopting the BUG options screen would veer into attempting a full merge.) Oh, and the slider widget is a bit glitch-y, probably an issue in the EXE; after moving the slider, it'll often slip a little bit to the left or to the right.
Platy's UI uses plus/ minus buttons instead, not sure if that's better.
About all components of BUG, there's a question of how tightly they're coupled with the core of the mod. No problem there with the FoV slider probably; I think all the changes are in CvMainInterface.py, tagged "BUG - field of view" comments. The Dot Map has more dependencies; the main file is
Contrib\CvStrategyOverlay.py.
The most essential BUG features to me deal with diplomacy and are probably not applicable to Col (
"Civ4lerts" about available tech trades and changes in worst-enemy status, un-hidden AI diplo modifiers,
customizable scoreboard). Also some hover text added by BULL here and there that accomplishes more for me than some of the overblown Advisor screens. But I suppose that's specific to BtS, and WtP presumably has already made its own improvements to game text.
Don't know what the status of Colopedia is in WtP; but overhauling that (possibly based on
Sevopedia, PlatyPedia or the revised Civilopedia in Realism Invictus) sounds like a big project. Given the greater focus on the economy in Col, one would think that the
Customizable Domestic Advisor from BUG could be useful, but I suspect that the challenges in managing a network of colonies are too different. City managment in BtS is largely about population growth and the current production item.
Maybe the
Reminders component? (Lets the player send a note to him- or herself that'll appear after a set number of turns.) Don't know how easy that would be to adopt. Or
Tick Marks on certain progress bars (though the research bar is the one where that matters most in BtS). The
Sentry Heal mission (wake up when fully healed
or when enemies approach) could be nice to have, but the.BULL implementation isn't multiplayer-compatible, and my own implementation in AdvCiv (change id "advc.004l" in code comments and manual) consists of quite a number of changes scattered across CvSelectionGroup.cpp and other parts of the DLL.
For
documentation that lists BUG features, you may want to consult the "Included Mods" section of the
help file that comes with BUG. That only covers BUG 3.5.
BUG 3.6 to 4.5 and
BULL are covered by changelog text files. I'm attaching the BAT 4.1 credits text file because I can't find it (separately) online, but I don't think that'll be very relevant – BAT doesn't add much in terms of usability. (There is some confusion about this because v4.4 and v1.2 are the final "official" releases of BUG and BULL respectively, but BUG 4.5 and BULL 1.3 are included in BAT.)
Here's a short post of mine about UI additions in K-Mod. So K-Mod includes BUG but, for the most part, not BULL. Having started from K-Mod, AdvCiv was in the same place. Over the years, I've added perhaps half of the BULL features, usually with adjustments of my own. I've also added stuff that I came up with, but I don't really think any of that is worth porting.