Taser only hits a single target, so for farming it sucks. There are better skills to invest into anyway.
Auto attacks builds are basically dead (way too underpowered compared to skill-based builds), so no point in putting points into Outrage and putting more than 1 point into DGS.
RIP does massive damage with good AoE, will probably be one of your best skills for killing linked+swelled mobs.
Napalm does decent damage and has “ok” AoE, but it feels very clunky to use, and sometimes it fires in a direction you are not aiming.
FMJ does great damage, but the downside on this one is that it only hits one target.
Mozambique hits 2 targets, does high damage and is somewhat spammable, so I like it.
If I were to make a Link-Thaum-BM, I’d go 1 DGS, 5 Silver, 15 RIP, 1 Tracer, 10 Mozambique, 13 Overdrive. But hey, these are just the skills I like.