So darksend transaction fees can be very large compared to other cryptos since it rounds up to .1 dash. Is anything going to be done about that?
0.1 = ~20 cents. Once we are 10 times larger (i.e. $20 per DASH) we'll just introduce new denomination. Until then it doesn't make sense to mix such small amounts (0.01 is ~2 cents now) via DS.
EDIT: or we'll switch to v13 magic (whichever comes first

)
Speaking of darksend mixing. Try it out. There may or may not be one or more liquidity providers online and ready for mixing.
Your voting Dash at work.