Percussion Notation

[cdg]

version 2.14.1 

First off, I'm VERY new to using Lilypond. I'd consider myself quite an advanced
 Finale user, but I'm having 
a blast with Lilypond! 

I am a percussionists, so maybe I'm a little more picky in the percussion 
notation for a few things. But my 
main concern for now is the notation of rolls. The 3 slashes are great.
 Two slashes on a flagged 8th note, I 
was hyping that the slashes were shortened to avoid colliding with
 the flag! NO other program does this, 
and I haven't observed it any any of the music I have—love it! 

However, one slash on a stemmed 16th note or two slashes on a
 stemmed 8th note, not a fan. These 
appear to be the same thickness as a beam, and 
worse of all, are completely horizontal. 

So, is it possible to adjust the angle of these symbols?

On an unrelated issue and possibly quite the newbie question,
 in the tempo marking, is there a way to 1) 
remove the parenthesis from around the note and numerical value, 
2) make the note smaller, and 3) change the font of the numerical values.
 I've tried using \markup with little success. I can implement 
\markup fine with the preceding text, "Largo espressive" for example,
 but I can't seem to make it work for the following 'note value equals
 number' section. 

I'm stoked about diving into Lilypond! 

Thanks