So after ~1 a week of playing i've found that the make fleet button seems to be a blessing in diquise.
First of I found that just massing all the ships needed for an offencive/defencive operation into a single fleet would result in a horribad use of resources in battle unless an absurd amount of microing is used.
That let me to start using the *fleets* as battle groups instead
Example as Advent
7 Hv frigs for fire power
2 guards to keep them up
1 subj to cripple or support
2 lgt frigs to keep antimatter up
then making a number of susch grp's as fleets and then join them up with the jump as grp function. this greatly improves the combiened fleets battle preformance but i've come across a number of irritants that i dont really have any idear how to alliviate.
say theres 5 of such fleets joined in grp jump, they don't jump at the same time. Normally it's no worries theres 3-5-10sec from first jump to last ship jumps who cares, but every now and then a ship get's stuck for longer, still no worries, But sometimes it's a fleet leader and that makes his grp jump rigt back to him. Seeing 20 carriesrs jump right back out because the jerk i promoted to admiral 45 min ago turned out to be a toad and loosing all fighter cover is just a numbing expirience /wrists
and is there any way to not have newly build ships auto join fleets, that feature makes no sense what so ever imo. nornally i wouldent mind but because my fleet estup is as it is, i only have key binds to my 2 main combined fleets, it can very quickly become impossible to figure out what the fuck just hapend to all the newly built ships if if focus is shited to even a little while.
last, I was wondering if there is some way to selecet all ships in a fleet short of keybinding them to ctrl+number? i cant seem to find any but im geussing there is something like dubble clikking the fleet ldr should select all it's members, and i've just missed it somehow?
yaya i know l2spell or something but it's late and im stoned, and saying sorry is way easier than concentrating hehe 
/kruppe