Are you only allowed one skill per tier per category? (If yes, ignore the next question )
Could you not get a Tier 4 skill in 5.5 days?
2 x Tier 1, 1 x Tier 2 - giving 3 skills in the category in 2 days, then 3.5 days for the Tier 4 skill for a total time of 5.5 days (13 days for a rank 1 Tier 6 skill)
Are the percentages compounding on the relative speed value, or on the absolute speed value?
So 50% penalty reduced by 10% is 45%, reduced again is 40.5%, leading to a maximum moving speed while cloaked of ~78.5% of maximum speed at rank 9, as opposed to 130% (-50% at rank 1, plus 80% (ranks 2-9)).
Another small thing, is it possible to do a stupidity suicide by having Graviton Physics (and making a black hole) without first having Hyperspace Physics?
Very much looking forward to this game