Prepared my list ( played EU II many many years ):
1. If your country is fully covered/besieged by enemies you can bulid your army in capital of your ally, so war won't end so quickly. It would be 3x more expensive and You can only mount not more than manpower divided by 2 at one time.
2. After your capital was captured by enemy You cannot change your Politics (serfdom, centralisation and others) even if 10 years since previous change passed. This will continue till you free your capital. Now captial is +/- the same castle as every other, it should be more importand and better protected.
3. If there is a rebel probability in other country in province that is your national you can toss some money to the rebelians, that will raise rebel probability ( for example +2%) for 12 months, of course it will ruin your reputation.
4. Ultimatum. I want you to grant me military acces through your country, if not there will be a war between us. Something like that, of course Ultimatum not only reffers to MA.
5. More peace terms. For example, paying other country military maintaince costs for 2 years, paying contribution in installments etc.
6. Creation of embassy - that will systematically raise your relation with this country but will cost ya depending on number of provinces/ income of this country.
7. Buying a province. Colonial or your national only. Cost depending on population in this province, relations with country, economical power of province.
8. Exchange of technology, again it will cost you depending on relations, diffrences in tech. Only in your tech group.
9. Opion that will give you a chance of reading other nations historical events (for example in EUII I only was mentioned "Queen of Cyprus happend in X country" ok, but let me read the description of this event). We have many history fans here who want know what exactly is going in other countries.
And now some basic ideas:
- Give DEFENDER OF FAITH more priveledges, You paing 1000 for it and have only this CB profit, and that's why it is not so widely used option. It has more potential.
- Missionaries also are not well exploited, maybe give them some role in colonisation?
- Officers' Training Centre on your capital. To give you better but non historical commanders
- Historical monarchs, leaders, important cities, should have their small pictures (scalled paintings for example) . That would be really refreshing.
That's it. Sorry for my English