I'm not sure if I'm able to answer all your questions, but I'll see what I can do.
kiodos wrote:1 - I noticed some tanks moving by their side when jumping without wings flag, is this possible ?
I've seen it done with "Agility", "Thief" and "High Speed" flags.(Usually by jumping and with a slight turn it sometimes makes it seem like they might have jumped sideways.)
2 - Some tanks carrying the team flag have also other flags like wings or laser, etc ... again is it possible ?
I'm assuming you mean a player is holding the team flag and has other powers.
This is possible with plug-ins and has been done quite a bit. (See links I've placed below.)
Also there's custom flag plug-ins and there may be flags which aren't listed which appear.
3 - Can't lock the GM several times on target while other tanks can lock and kill me rapidly , is it question of training or just bad behaviours ?
GM works by locking on the nearest tank and by locking on to it by right mouse click. (If using default configurations.)
Also depending on where you play, GM has a very tight or very lose turn ratio.(Meaning in some areas it's possible to out-dodge a GM lock and while in others it's virtually impossible.)
Also GM can lock on to teammates. (So watch out for TKs.)
4 - Where I can find a description of the abilities of each flag ?
Depends a bit as there are custom flags, but there's a list of official flags which exist.
There's a few links I've provided below which might give a general idea of some of the custom ones which exist.Linkshttps://forums.bzflag.org/viewtopic.php?f=79&t=12418
- Fun with Genocidehttps://forums.bzflag.org/viewtopic.php?f=78&t=14156
- TeamWeapons - just startedhttps://forums.bzflag.org/viewtopic.php?f=79&t=18792
- Grenade flag release - as seen on Apocalypsehttps://forums.bzflag.org/viewtopic.php?f=79&t=17528
- OFFA Genocidehttps://forums.bzflag.org/viewtopic.php?f=79&t=12669
- Thief Kills plugin released!https://forums.bzflag.org/viewtopic.php?f=79&t=18075
- Extra Point Flags!https://forums.bzflag.org/viewtopic.php?f=79&t=17630
- UselessMine - Create Mines with the Useless Flag Once Again!