1) VBAM give you the way to resolve battles I don't want to play with Starmada? (usually too small, too uninteresting or too huge...)
Yes, you can use a strategic combat resolution engine built into VBAM to resolve battles that you don't want to play out on the table. Typically for die-hard Starmada players, that will end up being those battles that are either just too large to reasonably play using Starmada, or battles that are too inconsequential to be worth playing out in Starmada.
2) VBAM is an entire book keeping affair or it allows/is more a boardgame (with maps and counters?)
It is a pen-and-pencil rule system, so there will be bookkeeping involved. Will you have to become an accountant to play? No. It is far easier to keep track of things in VBAM than it is in a system like Imperial Starfire. If you have some good electronic aids available (word processor, spreadsheet, etc.) it will speed play up considerably, as you can let the computer do all of the math for you.
3) Any one has tried to produce counters/maps for VBAM?
The only map you would have to worry about (unless you introduce custom rules that say otherwise) is the galaxy map.
But VBAM has a forum? 8) (remember stupid newbie, vandering around...)
We have a YahooGroup setup; we don't have a web forum, since that would take more maintenance than we have time for at the moment (securing, patching, admining, etc.).
And I was also interested in opinion form people who had played the combined version especially how is the transitionbetween "strategic" warfare and tactical (starmada) one...
Going back and forth, the Starmada Edition covers how to convert damage back and forth. You have the option of either carrying forward specific damage per unit (ouch -- bookkeeping) or just use the notion of undamaged/crippled/destroyed that the VBAM CSCR combat rules use. So if a ship is crippled, it has a certain amount of Hull damage applied, IIRC -- it is assumed that repairs to other systems can be effected between battles.
I have never had any problems transitioning between the two, but I have to admit to only playing a small percentage of campaign battles in Starmada since I usually play solo, and playing out larger battles would take a long time to do by myself.
a linked question is who his the usual size of a starmda fleet? I fear that if I go strategic my temptation to do space version of Jutland (or leyte) will be difficult to resist...
Most of the time in Starmada games I average maybe 4-6 ships per star system without totally sapping my economy -- more if they are smaller, cheaper ships, fewer if they are large dreadnoughts. Larger battlefleets could be composed of as many as 20-30 ships easily, while still leaving enough in your other territories to defend them.
If you are concerned about fleet sizes, you can also increase the cost of ships or the cost to maintain them (or both) to help limit fleet sizes.
I have to admit I am biased, being involved in VBAM and all
-Tyrel