Not all of these would need to be actual decisions obviously:
National Youth Organisation/party youth organisation (mandatory or not)
Female conscription
War economy/Total war
Rationing (several decisions of varying degrees of strictness) for civilians
Rationing for soldiers
Sale of government property
Nationalization of private or foreign property
Petrol reserved for miitary and industrial use (while civilians will have to use replacement fuel)
Collectivization of agriculture (and the opposite)
Move capital
Resettle population/industry
Evacuate province population (example: Finnish Karelia)
Support/contact national resistance movement
Create exile radio station (mainly for occupied countries, can be done by either a neutral nation, allied nation or by the exiled nation itself
Accept foreign refugees (varying numbers, must be done by convoy if no land connection, will also temporarily claim some TC)
Train/recruit foreign national resistance troops (examples: Polish troops in British service, Norwegians in Sweden)
Diplomatic:
Recognize independence
Unrecognize independence
Recognize territorial sovereignty of specified provinces
Rollback recognition of territorial sovereignty of specified provinces
Open diplomatic relations (Embassy level, Consulate level, Chargé d'affaires level)
Close diplomatic relations (or reduce level)
Official declaration of war (previous declare war option switches name to open hostilities)
Send military aid (equipment)
Allow volunteers to specified nation's military
Send economic aid
Send humanitarian aid
Forbid *insert type of aid* aid deliveries from all countries (or specified country) through our territory (or puppets, automatically recommends allies to do the same)
Block aid *type* or all aid deliveries from country *a* to *b* through our territory (or puppets, automatically recommends allies to do the same)
Same as above but do so everywhere possible, including where our troops are situated
Order puppet regime to do *insert action/policy/decision*
Recommend ally to do *insert request*
Can attach rewards to the two decisions above
Military:
Destroy (infra, buildings, resources) or capture province not controlled by us, even if not at war (example: Anglo-French intentions on Swedish iron mines).
Destroy controlled province even if not currently losing a battle.
Efficiency for the options above affected by total firepower, supply efficiency and organisation of units stationed in province, may take time to cause damage.
Military manuevuer: costs supplies and oil, gives experience, some organisation, may reduce or increase morale, takes time, can be done to select provinces and is calculated like the option to increase supply efficiency with the offensive button.
Small military parade (1000+ men), large Military parade (10000+ men), huge military parade (100000+ men) - victory parades and such parades not regularly scheduled)