using rebel lands as buffer zones

[caravel]

Thank you for advice.

I am so enjoying my old version of MTW that I do not want to start play VI and XL version for a long time (even though I really look forward to play Cumans, Bulgarians, not mentioning all the Saxon factions etc.).

If you already own VI you should install it, as it won't stop you playing the original MTW campaigns, in fact it improves them, and adds new units.

However, I will install V1.01 patch after your kind advice. The question is: will I be able to finish my current campaigns (on V1.00) after patch installation? Sorry for a stupid one...

Finish your current campaign first, then delete all of your saves and install the patch. Be sure to download the correct language version of the v1.1 patch.

Regarding buffer zones and re-emergencies - sometimes it becomes a real challenge if you fight deep in Central Europe, and suddenly a faction reemerges in strength behind your lines...

To avoid re-emergence keep a close eye on province loyalty. This should be above 120% or factions will reemerge. Watchtowers, Border Forts, Churches, Militia Buildings and Brothels all help the loyalty of provinces, as do spies (alot) and a 200 man peasant garrison (the only use for peasants).

That is my single objection to reality of MTW play. There would be no chance in medieval Europe to keep huge empires as you often command in mid-game. Feudal lords and neighbors would tear sooner or later your kingdom apart.
The Shogun and unification of Japan is quite realistic concept...

Well that is a bit unrealistic. I play domination games but don't for 100%. I usually give up once I've taken and controlled what I want and there is no longer much of a threat.

Still, it is the best strategy game I have played on PC.