I think the general philosophy of the mod is to by default ignore pre-modern European wars because:
1) Most of them were too small in scale to be properly represented, and would often revert in some way or another in what in game terms would be a couple of turns (RFC Europe is much better for those),
and
2) If they occurred in a normal game, Europe would be disrupted which would have consequences on colonialism later. Not great for balance and relative historical accuracy if you're playing as, say, India and France did you the courtesy of taking out England in 1066.
UHV can afford to be more freeform though because they're purely initiated by the human player. However for England specifically I'm not sure it's great to give them another conquest goal when they already have a much more iconic one later. I did read suggestions though for some sort of "Splendid Isolation" goal which would be about not conquering Europe, but stopping any continental power from growing too powerful. Maybe something about score, or military power or territory conquered outside of their core. I talked about it here:
It would be neat though if the phrasing was so that you were discouraged from conquering continental territory yourself though.
I did consider much of what you’re saying when writing my post, and I’d like to give some responses.
Firstly, I think the idea of keeping Europe pacified until the later stages of the game is something that inevitably will have to change with the new map. There’s no point in adding Sweden to have them just sit around until the 30 years war, because while each individual conflict with Denmark could be considered minor, their historic rivalry must come to a head through war.
England and France aren’t poised for war currently – their interests don’t conflict until the colonial era. This would be fine as is, if the aforementioned wars were small in scale, but I disagree with such an assessment. While the HYW would be inconsequential in game as far as territorial changes go, this is only itself a consequence of the game not giving England any reason to care about the continent at all, which in my opinion doesn’t make for an engaging experience playing as England until colonialism kicks in.
With regards to what you say about railroading colonialism itself, I somewhat agree that European conflict could be a hindrance to that. I just don’t see France taking England on with regards to naval capacity as is – if England is serious about naval warfare, conquest of the isles is practically impossible. Even then, if it were to happen, stability could prevent France from conquering further than southern England – a Scottish colonial empire wouldn’t be too shocking, and if it were weaker than a British one then that just makes sense. I see your point though, would need some work.
Finally regarding the question of conquest goals – I concede that two of them might sound like much, but Britains history is undeniably one of conflict and conquest, having been at war with a vast majority of the worlds countries. I don’t feel a UHV with both a GP and a conquest side to it is too far fetched.
Splendid isolationism in game is most easily represented through a tall game, at least in regards to managing your core as such. I agree that England should inevitably fall into this position, but as I said, squeezing in the reason for why Britain got to that point is in my opinion desirable.
I see where you’re coming from with the balance of powers and all that. The problem with such a goal in this game is that it is boring and doesn’t give the player any meaningful rewards along the way. Also, the tech goal already incentivizes sabotage of your rivals – if Britain was made to struggle with overextension because of their colonial possessions, then the player would already be discouraged from conquering Europe and instead resorting to blockading and plundering their rivals as appropriate to wreck their economies.