The problem with the 1st edition RAW (rules as written) is that, if a character is mortally wounded, they will be completely out of commission for 2D days, with no other possible way for it to be sooner. That means for the rest of the adventure at least, they are just sitting there. That's because the original rules say (p.53)...

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A character's wound status can only be reduced by one degree. A character who is treated once cannot be healed further by medpacs - only rejuvenation tanks or natural healing. (p.53)
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And an incapacitated character is unconscious and the bacta tank heals them in 2D days. This may be realistic but unworkable at the table. This is probably why 2nd and 3rd editions allowed multiple medpac use with +5 difficulty per additional one used. But the problem with that solution is that it renders bacta tanks useless and ridiculous. One should always use multiple medpacs. Even if you had to wait a day between, 3 days is better than an average of 7 days. Neither the 1st or 2-3rd editions really work well.

I think I have a solution that keeps bacta tanks important and useful, but doesn't require a player to sit on the sidelines...

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MY HOUSE RULE:
You may make as many Medicine rolls as needed. Once you succeed, a medpac is expended and the character has been treated, decreasing their wound level by one. Medpacs may not improve wound status by more than 1 level, unless the character has been fully healed and is injured again, which resets these rules.

Further medpacs *may* be used on a still injured character (at +5 difficulty per previous use), but these uses do not change the wound status. Instead, it will revive the character (as well as stabilize them from death rolls if they are mortally wounded). Revived characters may act, but at the following penalties: wounded -0D, incapacitated -2D, mortally wounded -3D. If injured again, they still count as their actual wound status. This wound status (and these penalties) can only be removed by a bacta tank.

What this does, is allow a means to always keep a player in the game if they are mortally wounded or incapacitated, but still gives them a reason to seek out, and wait through, a bacta tank when they can get to one.

Example: they are mortally wounded. A medpac gets them to Incapacitated. A second medpac (at +5 diff) will not change them from Incapacitated. But it will allow them to get up and take actions (being pumped full of adrenaline and pain killers). They will be at -2D, but for more experienced players this is still decent and they can talk, give ideas, and do lots of things.

THEN, they are wounded again and drop unconscious and mortally wounded. Since they have not yet been fully healed, a third medpac (now at +10 diff) cannot change their status, but can be used to revive them *again*, stabilizing them (no more death rolls) and allowing them to play at -3D. If wounded again, they will be killed.

What do you think?