The short answer to that is "No".
In detail:
- Salvaging is not possible. The reasons for this are numerous. Defender and Ravir gave good reasons and a description of the current approach
HERE and
HERE. Whether or not actual salvaging will ever be implemented is yet undecided. If at all, however, it would most certainly be calculated and executed post-combat.
- Self-repair is not possible. This is Battletech, not Transformers or anything alike. If you are damaged, you need to find a repair bay or adapt to the thought of losing your Mech/vehicle at some point. Don't expect to ever see self-repair in MWLL. At this time, it's even highly unlikely that repair bays will be able to replace destroyed limbs let alone the lack of BT conformity of something like that.
- Taking limbs or components and throwing them at or beating others with those is not possible. Again, this is Battletech, not Gundam, not One Must Fall, not Transformers. You should not expect to see the throwing of objects in MWLL ever. Melee combat might make it into the mod at some point, but it's not very high on our list of priorities.