I like the veteran classes, or at least the bonus loadout points. The problem is they may expire quite quickly in the game due to friendly fire or even a transport accident, or just plain getting stuck. The problem is they occupy one of your five precious loadout slots. Heck eldar cant even save every one of their classes. Its crippling playing missing your limited loadout slots, especially since the premade ones are usually bad. They are already limited by spawn count.

Can we have dedicated slots for the veteran classes?

I think its ridiculous you don't have more by default. If they only make more slots through RTC instead of that in game currency, I'm gunna be so pissed.

With how vets are now, separate slot is a must.

Taking one to the battle without actual warband only cripples you for the match.

Solo players will never make a good use of veterans and its a waste for their loudouts.

I agree, needs its own slot. Just one would do, then you need to at least make a conscious decision about which one you want to customise. Any you have available should have a basic default to select though, so you can always play a veteran of any class, but the one you've customised will be better tuned to your needs.

I only play one or two classes at most with variations of said class(es), I'm okay with it. I don't play competitively however so I don't really try too hard to balance out my team. Losing a single slot to a veteran when you have a:

Electrified Choppa, Slugga Boy with a Krak Grenade,
Electrified Choppa, Slugga Boy with a Melta Bomb,
Electrified Choppa, Slugga Boy with a lot of armor/HP,
Electrified Choppa, Slugga Boy Nob,
Zapp Deffgun, Loota with extra ammo.

Kinda don't really need any more than that.

I'd put that somewhere stormboy with dual fuel regen wargear(the mobility and harassment possibilities!) or painboy to carry scrubs(and throw sicky bombs).

Other then that, looks about right for the last patch, for the current one, change slugga for shoota and you're good to go.

If you check UAT at the moment, you'll be pleasantly surprised by what you find there in respect to loadouts.