As always, the answer isn't necessarily another library. That seems to be a basic theme of my posts recently, whether it's a library, a computer, a plug-in...
1. You can get a very good timp gliss with old-fashioned pitchbend. Actually, that's probably the single thing pitchbend does most realistically.
2. EQ and exciters can do a *lot* for percussion (among other instruments, but we're talking about percussion).
Recently I needed an orchestral-ish snare - that is, one that had the close-up brightness of a drumset snare but the subtlety of an orchestral one. They all sounded too dark except the one in Vir2 Elite Orchestral Percussion, which also "plays" really well from my BopPad perc controller... but it has a small room sound that wasn't working for me.
Okay, I'll admit that the first thing I reached for is an exotic plug-in: Zynaptic Unveil, an amazing de-reverbing plug-in. It does the job very well, but the nature of its process is that it has a lot of latency, i.e. it's a post-production processor intended for clean-up rather than a real-time snare-with-room-I-don't-like remover.
But ignore that. What I ended up using is VSL's magnificent exciter on another snare. I don't even remember which one it was - the point is that the exciter totally transformed it. You can do the same sort of thing with EQ.