hei vincent
honestly, two of those questions you would like to get an answer for are really tricky.
1. no, i doubt that, you should get in contact with the federal bureau of police infozsw@fedpol.admin.ch
2. that is different from site to site, there is no general ban, but pyrotechnics are restricted by some laws which probably no one here knows in the required depth to answer your question totally correct. to be on the safe side I would refrain from using any for now.
3. yes, the have to be pmr or cb, everything else is regulated and needs to have a permit (if there is one)
4. the law concerning public accessability of forests is pretty complex. in general there are some forest-sites, some cqb fields, some gravel pits...
If you are moving to switzerland permanently, I guess you will have some permit like permit B or C, that makes the whole import of airsoft guns easier - but refer to answer 1.
Be aware, airsoftguns are weapons and not toys. Silencers are illegal if they are filled with foam or anything sound-supressing. Lasers are illegal. Weapon-mounted night-vision-devices are not legal either...
happy moving
