Hello.
1) I need to customize keyboard map on symbos, because Brazilian Expert use a particular keyboard map, but i need a character map to get key codes.
1a) Sugestion... The possibility of using keymaps loaded from the disk would be interesting. 
2) How can I convert any image (bmp, jpg, gif) format for use in SymbOS as wallpaper?
3) The SymbOS presents "glitches" in the icons and images when loaded in CIEL 2+ FM at 7MHz. Where can I report this problem?
Hi, Your Answers:
1) I need to customize keyboard map on symbos, because Brazilian Expert use a particular keyboard map, but i need a character map to get key codes.
1a) Sugestion... The possibility of using keymaps loaded from the disk would be interesting.
This is possible. Go to the control panel and choose keyboard. Customize your keyboard by filling in the codes and keys for the "correct" key. You can save it. Please send me the keyboard layout when you are done. Then we can share it at a next SymbOS release.
2) How can I convert any image (bmp, jpg, gif) format for use in SymbOS as wallpaper?
There are several ways. You can use SymStudio or Unify to convert a image. Also Nyyrikki created a tool for MSXDOS to do this job. Prodatron created also a visualbasic probram, where you can convert RAW photoshop format to SGX files (background files in SymbOS) If you like i can send you the source.
3) The SymbOS presents "glitches" in the icons and images when loaded in CIEL 2+ FM at 7MHz. Where can I report this problem?
I have seen this on a Turbo-R as well. This is a known bug. (And cannot be reproduced on OpenMSX somehow) (It is only with real hardware) But not sure it is the same as yours? Can you post a image? So maybe it looks the same.
- in which git host are SymbOS sources hosted? gitlab? bitbucket? github? i can’t find it anywhere..
- if SymbOS sources were not released yet, how soon they will be? or if they will never be released, how soon can we expect, or help to contribute to the developmento to an alternative to SymbOS, totally software-libre, whatever compatible or not?
All sources are open for applications. How every the core part of SymbOS is not open. This to avoid people break the compatibility between different z80 machines. However not sure what Prodatron (developer of SymbOS) will do in the future. I heard that he have plans to open all.
- how can we develop software to SymbOS (like those coming preinstalled), and which development tools were used up to now?
Currently you can use any text editor you like 
There is some documentation on the symbos website as well. (How you can talk to the OS and things like that. You can also use SymStudio (old version, never released) or the beta version of Unify. (Which work but is still beta and also never released) Currently Trebmint is working on Quigs IDE. Which he is planning to release when it is finished as well. Currently i use it as a "beta" tester to make email program for SymbOS.
- SymbOS GUI seems to get inspired from ms-windoze or ReactOS - how easily can we configure it to look more like NeXT-Step, Motif-4DWM, MacOS-Classic, BeOS/Haiku, AmigaOS (1 to 3) and ArOS, etc.?
I am not sure. I know there where plans to make "skins" in the past. But there is a lot that have to be done currently. So i think it have lower priority at the moment. But it can also be that it simply does not fit anymore in the core to make changes like this.
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