To change either of the .2da files mentioned above download KOTOR Tool from here
(please note you may also need to install Microsoft.NET Framework)
Next run KOTOR Tool and under KOTOR 1 click BIFs --> 2da.bif -->2D Array and double click one of the files you want to amend, you will see a table with numbers in.
The label column represents the NPC level jcn is for consular jsn is sentinal jgd is for guardian, so from there it is a simple matter of altering the numbers to what would suit you 1 is for one force power every level 2 is for 2 etc.
As for featgain.2da it is very similar to above though there are more columns, however I am unsure which of the dr columns you should use Stoffe or Redhawke should know.
I hope this helps.
Edit. I think the columns for the droids are drx is for expert droid (T3) and drc is for combat droid (HK) someone put me right if I am wrong.